Question

A convex lens of focal length $100cm$ and a concave lens of focal length $10cm$ are placed coaxially at a separation of $90cm$. If a parallel beam of light is incident on convex lens, then after passing though the two lenses the beam

• A. Converges
• B. Diverges
• C. Remains parallel
• D. Disappears

Answer 1

The correct option is C Remains parallel

The parallel beam of light first hits the convex lens.

Then,

The light converges.

The converging beam of light hits the concave lens.

Then,

the beam of light gets parallel.

Hence, Option $C$ is correct.