The object or image distance is taken as positive

if the length is measured opposite to the direction of the incident ray

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if the length is measured in the direction of the incident ray

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if the length is measured opposite to the direction of the refracted ray

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None of these

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Solution

The correct option is B
if the length is measured in the direction of the incident ray

The object or image distance is taken as positive if the length is measured in the direction of the incident ray. It is simply taken due to sign convention.
Hence the correct option is (b).

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