Question

Linearly polarized light (free space wavelength 𝜆0= 600nm) is incident normally on a retarding plate (𝑛𝑒-𝑛𝑜 = 0.05 at 𝜆0= 600nm). The emergent light is observed to be linearly polarized, irrespective of the angle between the direction of polarization and the optic axis of the plate. The minimum thickness (in µm) of the plate is:

• A. 6
• B. 3
• C. 2
• D. 1

Answer 1

Answer: (A)

6

Answer 2

The correct option is (A): 6