Question

Convex lens of very short focal length will make:

• A. Higher divergence of light rays
• B. Lesser divergence of light rays
• C. Lesser convergence of light rays
• D. Higher convergence of light rays

Answer 1

The correct option is D

Higher convergence of light rays

For the same aperture, as the curvature decreases, focal length of the convex lens increases. Therefore, focal length of lens 2 is greater than lens 1. Clearly, lens 1 bends the light rays more, hence smaller focal length means higher convergence.