Question

A ray of light normally on one of the faces of a right-angled isosceles glass prism is found to be totally reflected. What is the minimum value of the refractive index of the material of the prism ?

Answer 1

Here `45^(@) gt C`
`because sinC = (1)/(mu)`
`:. sin 45^(@) gt (1)/(mu)`
or `(1)/(sqrt(2)) gt (1)/(mu)` or, `mu gt sqrt(2)`