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According to Cartesian sign convention, in ray optics:

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All distances in the direction of incident ray are taken positive.

All distances are taken negative.

All distances in the direction of incident ray are taken negative.

All distances are taken positive.

answer is A.

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Detailed Solution

All the distances are measured from the optical centre. The distances measured in the direction of incident rays must be positive and all the distances measured in the direction opposite to that of the incident rays must be negative.

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