Q. Find the thickness of a plate which will produce a change in optical path equal to half the wavelength $\lambda$ of the light passing through it normally. The refractive index of the plate $\mu$ is
A) $\frac{\lambda}{4(\mu - 1)}$
B) $\frac{2\lambda}{4(\mu - 1)}$
C) $\frac{\lambda}{(\mu - 1)}$
D) $\frac{\lambda}{2(\mu - 1)}$
Explanation
(d) From $(\mu - 1)t = n\lambda$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.