Question

When light wave suffers reflection at the interface between air and glass, the change of phase of reflected wave is equal to

• A. zero
• B. $\pi / 2$
• C. $\pi$
• D. $2 \pi$

Answer 1

Answer: (C)

$\pi$

Answer 2

The reflection of light wave is shown as

The change of phase of reflected wave is $180^{\circ}$.