Assertion : If optical density of a substance is more than that of water then the mass density of substance can be less than water. Reason : Optical density and mass density are not related.

Foundation

Physics Foundation

Light

refraction from lens

Refraction and parallel slab

Question

Assertion : If optical density of a substance is more than that of water then the mass density of substance can be less than water.
Reason : Optical density and mass density are not related.

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Both Assertion and Reason are incorrect.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Assertion is correct but Reason is incorrect.

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Optical density and mass density are not related. Optical density is related to how much light bends due to refraction. So, if optical density of an object is greater than that of water, its mass density can be lower than that of water. Therefore, assertion and reason are both correct and reason is the correct explanation of assertion.