Question

The maximum value of refractive index of a prism which permits the transmission of light through it when the refracting angl e of the prism is `90^@,` is given by
A. `1.500`
B. `1.414`
C. `2.000`
D. `1.732`

Answer 1

Correct Answer - B
Condition of no emergence,
`Agt2 theta_C`
`:. theta_CltA/2 or 45^@`
`:. Sin theta_C` or `1/multsin 45^(@)` or `(1)/(sqrt(2))`
For no emergence, `mugtsqrt2`