Question

When the angle of incidence is 42° then in what path will the ray refract through a glass block in total internal reflection ?

Answer 1

hey mate here is the answer

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here angle of incidence (i) = 42°

refractive index of glass (n) = 1.5

for total internal reflection, we know that the angle of refraction must be 90°

let critical angle = C

therefore, 1/sin C = n

=> sin C = 1/1.5

=> C = sin^-1(0.66)

=> C = 41.3°

since glass is denser medium the ray will bend towards the normal

hope it helpsO:-)

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