Question

1. parallel light rays are refracted ___ and _____ to a point called as focal point after passing through convex lens.
2. parallel light rays are refracted _____ and appear to ______ from a point called as focal point called as focal point after passing through concave lens.


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Answer 1

Principal or first focus is the point from which incident rays after passing through convex lens, become parallel to the principal axis.

A ray of light passing through the focal point at an angle to the optic axis of a concave mirror is reflected back.

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