The block shown above is made of glass of refractive index for green light 1.3 a

Question

The block shown above is made of glass of refractive index for green light 1.3 and is surrounded by air. Green laser light inside the block is totally reflected if the angle smaller than a is can never totally reflect less than 50.3 degree less than 100.6 degree greater than 100.6 degree greater than 50.3 degree If the blue laser light is used in the same set-up, the angle of total internal reflection a_blue is larger than a the same as a smaller than a undefined because green laser doesn't totally reflect

Explanation / Answer

the correct option should be ( the same as alpha)

total internal reflection depends upon angle of incidence and refractive index

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