Question

(1) Which is optically denser: air or water give a reason?
(2) Out of air or glass, which is optically rarer? give a reason?​

Answer 1

2. A medum is rarer when the speed of light travels through that medium. Speed of ligh in air is more than speed of light in glass. which means air is optically rarer than glass.

Explanation:

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Answer 2

1)

When water travels through water, its speed gets reduced. Hence, it is a optically denser medium. Speed of light in air is more than speed of light in water, which means water is optically denser than air.

2)

A medium is rarer when the speed of light increases when light travels through that medium. Speed of light in air is more than speed of light in glass, which means air is optically rarer than glass.