Physics

How does the speed of light determine the optical density of a medium?

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A medium is said to be denser if the speed of light in it decreases, while it is said to be rarer if the speed of light in it increases.

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Column A	Column B
(a) White light	(i) convex mirror
(b) Refraction	(ii) concave mirror
(c) Virtual images	(iii) refraction
(d) Real images	(iv) spectrum
(e) Prism	(v) ray of light from glass to air