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a mirror of focal length f=+10 cm. Is it convex or concave ?

a mirror of focal length f=+10 cm. Is it convex or concave ?

Grade:12

1 Answers

Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
9 years ago
In a concave lens, the rays parallel to the principal axis diverge after refraction and hence appear to meet before the optical centre. Therefore, The focus is negative. Whereas, in a convex lens the rays meet after the optical centre once refracted, So the focus is positive. In the question, the lens referred to is convex.

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