NCERT Solutions for Class 7 Science Chapter 11 Light
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Book Name: Science
Subject: Science
Chapter Number: 15
Chapter Name: Light
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Book Name: Science
Subject: Science
Chapter Number: 15
Chapter Name: Light
You can also bookmark this page by clicking + Save to Library icon and refer to these NCERT Solutions anytime from your account. More Detail
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Page 1
NCERT
SOLUTIONS
CLASS - 7TH
aglase .co
SOLUTIONS
CLASS - 7TH
aglase .co
Page 2
Book : Science Ncert Solutions | Chapter-15 Science
Class : 7th
Subject : Science
Chapter : 15
Chapter Name : Light
Q1 Fill in the blanks:
(a) An image that cannot be obtained on a screen is called ____________.
(b) Image formed by a convex __________ is always virtual and smaller in size.
(c) An image formed by a __________ mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a _________ image.
(e) An image formed by a concave ___________ cannot be obtained on a screen.
Answer. (a) An image that cannot be obtained on a screen is called virtual image.
A virtual image cannot be obtained on a screen. Only real images can be obtained on a screen.
(b) Image formed by a convex mirror is always virtual and smaller in size.
A convex mirror forms a virtual, diminished and upright image of an object.
(c) An image formed by a plane mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a real image.
Only real images can be obtained on a screen.
(e) An image formed by a concave lens cannot be obtained on a screen. The image formed by concave lens is
always virtual. A virtual image cannot be obtained on a screen.
Page : 189 , Block Name : Exercise
Q2 Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) We can obtain an enlarged and erect image by a convex mirror. (T/F)
(b) A concave lens always form a virtual image. (T/F)
(c) We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)
(d) A real image cannot be obtained on a screen. (T/F)
(e) A concave mirror always form a real image. (T/F)
Answer. (a)False
The image formed by a convex mirror is always virtual, diminished and erect.
(b) True
The image formed by a concave lens is always virtual, erect and diminished.
(c) True
The image formed by a concave mirror can be real or virtual, enlarged or diminished, and erect or inverted,
depending upon the distance of the object from the mirror.
(d) False
The image that can be obtained on a screen is called a real image. Virtual images cannot be obtained on a
screen.
(e) False
A concave mirror can form both real and virtual images. The nature of the image depends on the distance of
the object from the mirror.
Page : 189 , Block Name : Exercise
Page 1 of 5 Aglasem Schools
Class : 7th
Subject : Science
Chapter : 15
Chapter Name : Light
Q1 Fill in the blanks:
(a) An image that cannot be obtained on a screen is called ____________.
(b) Image formed by a convex __________ is always virtual and smaller in size.
(c) An image formed by a __________ mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a _________ image.
(e) An image formed by a concave ___________ cannot be obtained on a screen.
Answer. (a) An image that cannot be obtained on a screen is called virtual image.
A virtual image cannot be obtained on a screen. Only real images can be obtained on a screen.
(b) Image formed by a convex mirror is always virtual and smaller in size.
A convex mirror forms a virtual, diminished and upright image of an object.
(c) An image formed by a plane mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a real image.
Only real images can be obtained on a screen.
(e) An image formed by a concave lens cannot be obtained on a screen. The image formed by concave lens is
always virtual. A virtual image cannot be obtained on a screen.
Page : 189 , Block Name : Exercise
Q2 Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) We can obtain an enlarged and erect image by a convex mirror. (T/F)
(b) A concave lens always form a virtual image. (T/F)
(c) We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)
(d) A real image cannot be obtained on a screen. (T/F)
(e) A concave mirror always form a real image. (T/F)
Answer. (a)False
The image formed by a convex mirror is always virtual, diminished and erect.
(b) True
The image formed by a concave lens is always virtual, erect and diminished.
(c) True
The image formed by a concave mirror can be real or virtual, enlarged or diminished, and erect or inverted,
depending upon the distance of the object from the mirror.
(d) False
The image that can be obtained on a screen is called a real image. Virtual images cannot be obtained on a
screen.
(e) False
A concave mirror can form both real and virtual images. The nature of the image depends on the distance of
the object from the mirror.
Page : 189 , Block Name : Exercise
Page 1 of 5 Aglasem Schools
Page 3
Book : Science Ncert Solutions | Chapter-15 Science
Q3 Match the items given in Column I with one or more items of Column II.
Answer: (a) (v)
A plane mirror forms an image which is erect and of the same size as the object.
(b) (ii) and (vi)
A convex mirror forms a virtual, diminished, and upright image and therefore, covers a larger area of view.
Its eld of view is very large.
(c) (i)
A convex lens can form a magni ed image of the object. Therefore, it is used as a magnifying glass.
(d) (iii)
A concave mirror forms an enlarged image of the object. Therefore, it is used to see an enlarged image of
teeth by the dentist.
(e) (vi)
The image formed by a concave lens is always virtual, upright and erect.
Page : 189 , Block Name : Exercise
Q4 State the characteristics of the image formed by a plane mirror.
Answer. The image formed by a plane mirror is erect, laterally inverted, and of the same size as that of the
object. The left side of the object appears on the right side of the image. Also, the distance of the image
from the plane mirror is same as the distance between the plane mirror and the object.
Page : 189 , Block Name : Exercise
Q5 Find out the letters of English alphabet or any other language known to you in which the image formed
in a plane mirror appears exactly like the letter itself. Discuss your ndings.
Answer. If the letters of English alphabet A, H, l, M, O, T, U, V, W, X, Y are kept in front of a plane mirror,
then they would form images which exactly look like the original letters of the alphabet. These letters are
vertically symmetric. For example, if we divide letters A and U in the middle, then we would nd that the
right halves are equivalent to the left halves of the letters.
Page 2 of 5 Aglasem Schools
Q3 Match the items given in Column I with one or more items of Column II.
Answer: (a) (v)
A plane mirror forms an image which is erect and of the same size as the object.
(b) (ii) and (vi)
A convex mirror forms a virtual, diminished, and upright image and therefore, covers a larger area of view.
Its eld of view is very large.
(c) (i)
A convex lens can form a magni ed image of the object. Therefore, it is used as a magnifying glass.
(d) (iii)
A concave mirror forms an enlarged image of the object. Therefore, it is used to see an enlarged image of
teeth by the dentist.
(e) (vi)
The image formed by a concave lens is always virtual, upright and erect.
Page : 189 , Block Name : Exercise
Q4 State the characteristics of the image formed by a plane mirror.
Answer. The image formed by a plane mirror is erect, laterally inverted, and of the same size as that of the
object. The left side of the object appears on the right side of the image. Also, the distance of the image
from the plane mirror is same as the distance between the plane mirror and the object.
Page : 189 , Block Name : Exercise
Q5 Find out the letters of English alphabet or any other language known to you in which the image formed
in a plane mirror appears exactly like the letter itself. Discuss your ndings.
Answer. If the letters of English alphabet A, H, l, M, O, T, U, V, W, X, Y are kept in front of a plane mirror,
then they would form images which exactly look like the original letters of the alphabet. These letters are
vertically symmetric. For example, if we divide letters A and U in the middle, then we would nd that the
right halves are equivalent to the left halves of the letters.
Page 2 of 5 Aglasem Schools
Page 4
Book : Science Ncert Solutions | Chapter-15 Science
Hence, even if the image interchanges sidewise, it will appear same as the letter.
Q6 What is a virtual image? Give one situation where a virtual image is formed.
Answer. When an image cannot be obtained on a screen, it is called a virtual image. The image formed by a
plane mirror is virtual, because the image cannot be obtained on a screen when placed either in front of the
mirror or behind it.
Q7 State two differences between a convex and a concave lens.
Answer. (i) Convex lens is thicker in the middle while concave lens is thinner in the middle.
(ii) A convex lens converges the light ray falling on it, while a concave lens diverges the light ray falling on
it.
Q8 Give one use each of a concave and a convex mirror.
Page 3 of 5 Aglasem Schools
Hence, even if the image interchanges sidewise, it will appear same as the letter.
Q6 What is a virtual image? Give one situation where a virtual image is formed.
Answer. When an image cannot be obtained on a screen, it is called a virtual image. The image formed by a
plane mirror is virtual, because the image cannot be obtained on a screen when placed either in front of the
mirror or behind it.
Q7 State two differences between a convex and a concave lens.
Answer. (i) Convex lens is thicker in the middle while concave lens is thinner in the middle.
(ii) A convex lens converges the light ray falling on it, while a concave lens diverges the light ray falling on
it.
Q8 Give one use each of a concave and a convex mirror.
Page 3 of 5 Aglasem Schools
Page 5
Book : Science Ncert Solutions | Chapter-15 Science
Answer. Concave mirrors can form enlarged image of the object. Therefore, they are used by the dentist to
see the enlarged image of the patient's teeth. Convex mirror forms diminished and upright image of the
object. It is used as a side view mirror of the car because it enables the driver to view objects spread over a
large area behind him/her.
Q9 Which type of mirror can form a real image?
Answer. A concave mirror can form real image of an object. The nature of the image depends on the
distance of the object from the concave mirror.
Q10 Which type of lens forms always a virtual image?
Answer. A concave lens always forms a virtual image of an object.
Q11 A virtual image larger than the object can be produced by a
(i) concave lens
(ii) concave mirror
(iii) convex mirror
(iv) plane mirror
Answer. (ii) Concave mirror can form virtual and magni ed image of the object.
Concave lens and convex mirror forms virtual but diminished image of the object. Plane mirror forms
virtual and same size image of the object.
Q12 David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If
he moves I m towards the mirror, then the distance between David and his image will be
(ii) 5 m
(iii) 6 m
(iv) 8 m
Answer. (iii) 6 m
In the case of a plane mirror, the distance between the object and the mirror (dl) is same as the distance
between the image and the mirror (d2).
Page 4 of 5 Aglasem Schools
Answer. Concave mirrors can form enlarged image of the object. Therefore, they are used by the dentist to
see the enlarged image of the patient's teeth. Convex mirror forms diminished and upright image of the
object. It is used as a side view mirror of the car because it enables the driver to view objects spread over a
large area behind him/her.
Q9 Which type of mirror can form a real image?
Answer. A concave mirror can form real image of an object. The nature of the image depends on the
distance of the object from the concave mirror.
Q10 Which type of lens forms always a virtual image?
Answer. A concave lens always forms a virtual image of an object.
Q11 A virtual image larger than the object can be produced by a
(i) concave lens
(ii) concave mirror
(iii) convex mirror
(iv) plane mirror
Answer. (ii) Concave mirror can form virtual and magni ed image of the object.
Concave lens and convex mirror forms virtual but diminished image of the object. Plane mirror forms
virtual and same size image of the object.
Q12 David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If
he moves I m towards the mirror, then the distance between David and his image will be
(ii) 5 m
(iii) 6 m
(iv) 8 m
Answer. (iii) 6 m
In the case of a plane mirror, the distance between the object and the mirror (dl) is same as the distance
between the image and the mirror (d2).
Page 4 of 5 Aglasem Schools
Page 6
Book : Science Ncert Solutions | Chapter-15 Science
Given,
Distance between the mirror and David's image, d2 = 4 m
Therefore, d1 = d2 = 4 m
If David moves 1 m towards the mirror, then dl = 4 - 1 3m
Again, d1 = d2 = 3 m
Therefore, the distance between David and his image is d1 + d2 = 3+3 = 6m.
Q13 The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The
driver sees in his rear view mirror the image of truck parked behind his car. The speed at which the image of
the truck appears to approach the driver will be
(i) 1 m/s
(ii) 2 m/s
(iii) 4 m/s
(iv) 8 m/s
Answer. (iii) 4 m/s
The speed of the car is 2 m/s which means the car is approaching the truck with a speed of 2 m per second.
The distance between the car and truck will decrease at a double rate. This is because the image of the truck
will travel a distance twice the distance travelled by the car in equal time. Hence, the image of the truck will
appear to approach the driver with the speed of 2 x 2 = 4 m/s.
Page 5 of 5 Aglasem Schools
Given,
Distance between the mirror and David's image, d2 = 4 m
Therefore, d1 = d2 = 4 m
If David moves 1 m towards the mirror, then dl = 4 - 1 3m
Again, d1 = d2 = 3 m
Therefore, the distance between David and his image is d1 + d2 = 3+3 = 6m.
Q13 The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The
driver sees in his rear view mirror the image of truck parked behind his car. The speed at which the image of
the truck appears to approach the driver will be
(i) 1 m/s
(ii) 2 m/s
(iii) 4 m/s
(iv) 8 m/s
Answer. (iii) 4 m/s
The speed of the car is 2 m/s which means the car is approaching the truck with a speed of 2 m per second.
The distance between the car and truck will decrease at a double rate. This is because the image of the truck
will travel a distance twice the distance travelled by the car in equal time. Hence, the image of the truck will
appear to approach the driver with the speed of 2 x 2 = 4 m/s.
Page 5 of 5 Aglasem Schools
Document Details
| Board / Org | NCERT |
| Exam | Class 7 |
| Type | Solution |
| Pages | 6 |
| Updated | 30 Apr 2026 |