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Q.
When a light wave suffers reflection at the interface from air to glass, the change in phase of the reflected wave is equal to
UP CPMTUP CPMT 2007
Solution:
When a light wave travelling from a medium of refractive index $\mu_{1}$ towards a medium of refractive index $\mu_{2}$ undergo a $180^{\circ}$ phase change on reflection when $\mu_{2}>\,\mu_{1}$. No phase change occurs in the reflected light if $\mu_{2}<\,\mu_{1}$.
For air-glass interface
Since $\mu_{2}>\, \mu_{1}$, a light wave undergo a phase change of $\pi$
