Question

the angle of incidence i and angle of refraction r are equal in a transparent slab when the value of i is_______​

Answer 1

the angle of incidence i and angle of refraction r are equal in a transparent slab when the value of i is ninty degree...

Answer 2

Answer:  when the value is $0^{0}$

Explanation:

• Let,

           i be the angle of incidence of a ray in a vacuum

• r is the angle of refraction (angle between the ray in the medium and the normal),and  the refractive index n is defined as the ratio of the sine of the angle of incidence.

• When the incident ray falls normally on the glass slab it will be refracted without deviation i.e. along the normal in the glass slab.

So, ∠i = ∠r = 0.

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