when a light ray makes an angle of 90 degree while entering a glass slab from air , it ________.
A) bends towards the normal.
B) goes away from the normal.
C) goes straight without bending at glass-air interface.
D) returns back into the air.
Answers
Answer:
C) goes straight without bending at glass-air interface.
Explanation:
Refraction is the process of bending of light as it moves from one medium to another.
When light ray from air in incident to a glass slab at any angle except 90 degrees, refraction occurs and the light ray bends towards the normal.
This happens because a light ray is itself a combinations of many light rays and when light is incident at any angle except 90 degrees, all the light rays don't reach the glass slab at the same time. Some reach early and some reach a little late. This is the cause for refraction.
But, when it is incident at 90 degrees, all the rays of light reach at the same time and hence, no refraction will occur.
Answer:
the answer is goes straight without bending at glass air interface please mark as brainly