Question

Critical angle for total internal reflection will be smallest for light traveling from:

• A. Water to Glass
• B. Glass to Water
• C. Glass to Air
• D. Water to Air

Answer 1

Answer: (C)

Glass to Air

$\begin{array}{c}\text{The critical angle for the total internal reflection will be}\\ \text{smallest for light travelling from glass to air.}\\ \text{When the angle of incidence greater than the}\\ \text{critical angle, the light suffer total internal reflection,}\end{array}$

$\begin{array}{c}\sin {\theta }_c=\frac{n_2}{n_1}\\ \text{Largest,}{n}_1\text{, minimum value}\\ \text{of}\sin {\theta }_c\text{, Minimus}\theta \text{c}\\ \text{Hence,}\left(c\right)\text{is correct option}\end{array}$