Question

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

Answer 1

answer is 60 degrees by using formula r = sin i / sin r

Answer 2

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°

plz mark as brainliest