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The angle of incidence $(i)$ and refraction $(r)$ is equal in a transparent slab when the value of $(i)$ is equal to which of the following?

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0 °

45 °

90 °

depend on the material of the slab

answer is A.

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Detailed Solution

The angle of incidence

(i)

and refraction

(r)

is equal in a transparent slab when the value of

(i)

is equal to

0 °

.
From Snell’s law, we know

sin i = μsin r

Where

i

is the angle of incidence

r

is the angle of refraction

μ

is the refractive index of the glass slab
When

i = 0^{o}

, then

\Rightarrow \sin 0^{o} = μsin r

\Rightarrow

r = 0

(as

\sin 0^{o} = 0

)

\Rightarrow

i = r

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