Question

use of concave lens
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Answer 1

Concave lenses are used for correcting short-sightedness i.e., myopia. Convex lenses are used for focusing light rays to make the objects to appear clearer and enlarged, like magnifying glasses.

Concave lenses are used in binoculars and telescopes so what you see is the correct color.

Hope it helps you...

Answer 2

Explanation:

convex lens of focal length 10 cm is in contact with a concave lens. The focal length of the combination is numerically equal to that of the concave lens. The focal length of the concave lens is