Question

(c) 1, 37, 51, ........
(d) . ..
(3) A parallel beam of light travelling in glass is incident obliquely on water surface
After refraction, its width .......
(a) decreases
(b) increases
remains the same
(d) becomes zero
sics-A-​

Answer 1

Answer:

b,) increase

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Answer 2

A parallel beam of light travelling in water is incident obliquely on a glass surface after refraction, it's width  remains the same.

Therefore, option (c) is correct.

Explanation:

We know that when a ray of light travels from denser to a rarer medium, it bends away from the normal and when it travels from rarer to denser medium, it bends towards the normal.

Since the beam of light is parallel and they all incident obliquely on water surface

Therefore the beam of light will have the same incidence angle and also the same refraction angle

Hence, after refraction, the beam of light will be parallel again

Hope this answer is helpful.

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