Question

In which among the
following cases will
you get reflected/refracted
ray parallel to the
Incident ray?

A. When a convex
lens is placed
adjacent to
concave lens

B. When two plane
mirrors are placed
perpendicular to
each other.

C. When light ray
comes out of
rectangular glass
slab

D. When light ray
comes out of a
triangular prism
a triangular prism​

Answer 1

Answer:

Both B &C

Explanation:

Answer 2

Answer:

Option (B) When two plane mirrors are placed perpendicular to each other the correct.

Explanation:

Look at the image attached.

You can see that the reflected ray D is emerging out parallel to the incident ray A. This phenomenon is observed when the plane mirror of the final reflected ray and the plane mirror of the original ray (incident ray) are perpendicular to each other.

Conclusion:

When two plane mirrors are placed perpendicular to each other, the reflected ray will be parallel to the incident ray.