Question

calculate the angle of incidence of a light ray incident on surface of a plastic slab of refractive index root 3 if the angle refraction is 30°​

Answer 1

Explanation:

We know that, refractive index= sin i/ sin r        [here i=∠ of incidence, r =                                                                                                 ∠of refraction]                So, √3 = sin i/ sin 30°

                       √3 = sin i/ 1/2

                      so, sin i = √3 * 1/2

                            sin i = √3/2

                   

                  clearly, sin i = sin 60°

 So ,angle of incidence = 60°

Answer 2

Answer:

Explanation:

Given that,

Angle of refraction = 30° = r

Refractive Index = √ 3

Let, Angle of Incidence = i

We know that,

Refractive index = sin i / sin r

So, √ 3 = sin i / sin 30

So, √ 3 = sin i / ( 1 / 2)

So, sin i = √ 3 / 2

So, i = 60°

Hence, angle of incidence is 60°

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