Grade 7: Spot Test - 2 (20.11.
2024) - 10 Marks
1. What do you mean by refraction?
2. Complete the sentences, using ‘faster’ or 'slower'.
(a) Light travels ______________ in water than it does in air.
(b) Light travels ______________ in air than it does in glass.
3. Complete the sentences, using ‘away’ or 'towards'.
(a) Light travels from denser (more dense) to rarer (less dense), light bends _____________
from the normal.
(b) Light travels from rarer (less dense) to denser (more dense), light bends _____________
the normal.
4. Complete the sentence to describe refraction correctly.
Refraction of light happens when light ______ direction because of a change in _________.
5. Draw a ray diagram to show what happens when the ray of light enters from air to the glass.
6. Say 'True' or 'False' for the following sentence:
(i) During refraction, the frequency of light waves does not change.
(ii) During refraction, the speed of light waves does not change.
(iii) During refraction, the wavelength of light waves does change.
(iv) Speed of light in air is very lesser that other media (say, Water, Glass).
7. Draw a ray diagram which shows that the refraction of light travels from air as it passes
through a glass rectangular block and finally emerges out from the block.
