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

Image distance for a convex mirror

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Height of a virtual and erect image

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Focal length of a convex mirror

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Object distance for a concave mirror

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Solution

The correct option is C Object distance for a concave mirror
According to new Cartesian sign convention, object distance for any lens or mirror is measured as negative. This is because, the object distance is measured against the direction of incident light.
So, for the given options, object distance for a concave mirror has a negative sign.

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