When ray of light falls normally on a mirror, its angle of incidence is 90°. True or false? Justify your answer.

Correct Answer - Critical angle

D) total internal reflection

C) critical angle

Correct option is  A) 0°

C) A + d = i1 + i2 

Given: ng = 1.52, nw = 1.33 To find: Critical angle (ic) formula: sin ic = \(\frac{n_2}{n_1}=\frac{n_w}{n_g}\) Calculation: From formula, ic = sin-1 \((\frac{1.33}{1.52})\) = sin-1 (0.875) = 61 °2′

When a ray of light is incident on a plane mirror at an angle θ, the reflected ray gets deviated by an angle of (π – 2θ).

A) Pass through the focus

Correct option is A) 45°

Correct option is C) 0°