NCERT Book Class 7 Science Chapter 11 Light

11 Light

Y
ou might have seen a beam of
sunlight when it enters a room
through a narrow opening or a hole.
You may have also seen beams of light from
the headlamps of scooters, cars and engines
of trains [Fig. 11.1 (a)]. Similarly, a beam
of light can be seen from a torch. Some of

(a) Rail engine (b) Light house
Fig. 11.1 Beams of light

you may have seen a beam of searchlight 11.1 LIGHT TRAVELS ALONG A
from a light house or from an airport STRAIGHT LINE
tower [Fig. 11.1 (b)]. Boojho recalls an activity he performed
What do these experiences suggest? in Class VI. In that activity he looked

(a) (b)

Fig. 11.2 Looking at a candle through a straight and a bent pipe

LIGHT 123