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Question

# New sign convention for convex lens are

A

Real object distance is positive

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B

Real object distance is negative

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C

Focal length is positive

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D

Focal length is negative

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Solution

## The correct option is D Focal length is negativeExplanationAccording to new sign conventions, for convex lens Objects are placed behind the pole thus the distance of the real object is negative. For a convex lens focal length is held in the front of the pole. Thus, the focal length is positive.Thus, the correct option is (b) & (d) . i.e. real object distance is negative and focal length is positive.

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