Question

material rock salt kerosene water diamond

refractive index 1.54 1.44 1.33 2.42

(i)in which of these does light travel fastest and why?

(ii)arrange these materials in ascending order of their optical densities.

Answer 1

Answer:

I. In water, light travel fastest.

II. Water‹ kerosene ‹ rock salt‹ diamond.

Explanation: As we know speed of light is inversely proportional to the refractive index. Higher the refractive index ,denser the optical.

Means more complexibility of light rays to travel .so light travel fastest in less denser optical like water as compared to rocksalt ,Diamond etc

Answer 2

Answer:

• Light travel faster in water.

• Water< Kerosene < Rock salt < Diamond

Explanation:

1. The light travel faster due to refractive index because as it is inversely proportional
2. Light travel fastest in less denser optical like water as compared to rock salt , Diamond etc.

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