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Q.

Which one of the following has a negative sign, on the basis of new Cartesian sign Convention?

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a

Height of a virtual and erect image

b

Focal length of a convex mirror

c

Image distance for a convex mirror

d

Object distance for a concave mirror

answer is D.

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Detailed Solution

According to the new Cartesian sign convention, object distance for any lens or mirror will be measured as negative. This is because the object distance will be measured against the direction of incident light. So, for the mentioned options, object distance for a concave mirror has a negative sign.

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