Question

Difference between sign convection in concave lense and convex lense

Answer 1

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Answer 2

CONCAVE LENS

• In concave lens image is always formed in front on the lens. Hence image distance will always be negative

Even its focal length will be negative.

CONVEX LENS.

• Since image is formed behind lens, the image distance and focal length will also be positive.

$\boxed{COMMON}$

Object distance is always negative since it is taken on the left side