Chapter SH, Problem 12.4APP

To determine

To explain: Changes in the ray of light travelling from water to air when it hits the boundary at an angle of $49°$ to the normal.

Answer to Problem 12.4APP

The ray leaving water and entering air will travel along the surface of water,

Explanation of Solution

Introduction:

The value of critical angle is $49°$ .

Since angle of incidence is equal to critical angle ( $49°$ ), the reflected ray travels along the surface of water. If the angle of incidence was greater than $49°$ , total internal reflection would have occurred.

Conclusion:

The ray leaving water and entering air will travel along the surface of water,