Questions on Light
Q15. The diagram below shows a ray of light entering a glass block.
(a) Most of the light goes into the glass block, but some does not. What happens to the light which does not go into the glass block?
It is reflected 
1 mark
(b) As the light goes into the glass block, it changes direction. What is the name of this effect?
Refraction
1 mark
(c) What is the name given to ray A?
The incident ray
1 mark
(d) What is the name given to ray B?
The refracted ray
1 mark
(e) Continue the ray out of the block into the air.
See diagram above:
Ray should bend away from the normal as it enters the air
Ray should emerge parallel to the incident ray
2 marks
(f) What is the name given to the ray you have drawn
The emergent ray
1 mark
Total 7 marks
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