Question

If a ray of light passes normally at right angles from one medium to another
medium, the angle of refraction is
(i) 90°
(ii) 45°
(iii) 0°
(iv) none of these​

Answer 1

Given info : If the ray of light passes normally at right angle from one medium to another medium.

To find : The angle of refraction is ..

solution : if you want one word answer, then the answer is 0°

now let's explain how it will be...

from Snell's law,

μ₁sinθ₁ = μ₂sinθ₂

where μ denotes refractive index of a medium and θ₁ is angle of incidence and θ₂ is angle of refraction.

if light passes normally at right angle from one medium to another medium.

angle of incidence, θ₁ = 90° - 90° = 0° [ angle between between ray and normal is 0° ]

so now, μ₁sin0° = μ₂sinθ₂

⇒0 = μ₂sinθ₂

⇒0 = sinθ₂

⇒θ₂ = 0°

Therefore the angle of refraction is 0°.

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Answer 2

Answer:

Hope it help you

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