Grade 12General Physics
a mirror of focal length f=+10 cm. Is it convex or concave ?
1 Answer
Apoorva Arora
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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