engineering recuitment BARC Stipendiary Trainee Category I 2023 Mock Test Physics Optics Refraction and Reflection
If a transparent parallel plate of thickness t and refractive index n is introduced perpendicularly in the light beam, the optical path is
1
increased by (n - 1)t
2
decreased by nt
3
decreased by (n - 1)t
4
increased by nt