Under what conditions do light rays become parallel after passing through a lens?

1 Answer
Pallu
Nov 24, 2017

When the light source is placed at the Focus (focal point) of the convex lens.

Explanation:

Convex lens is a converging lens.
When the incident ray is parallel to the principal axis, the refracted ray will pass through the focal point on the other side.
Whereas, when the ray is coming from the focus, it will travel parallel to the principal axis.
All the incoming rays from the focal point will emerge parallel to each other, and hence, no image is formed.

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