Question

When light waves suffers reflection at the interface from air to glass, the change in phase of reflected waves is equal to

• A. $0$
• B. $\frac{\pi }{2}$
• C. $\pi$
• D. $2\pi$

Answer 1

Answer: (C)

$\pi$

On reflecting from surface of a denser medium, the phase changes by $\pi$.

Since glass is denser than air, Change in phase = $\pi$

Answer. C) $\pi$