Question

Light travels slower in glass than in air because:
1) density of glass is less than that of air
2) density of glass is greater than that of air.
3) refractive index of air is greater than that of glass.
4) refractive index of air is less than that of glass.

Answer 1

correct optionis 4;;;;;;;;;;;;;;;;;;;;;;;;;;;

Answer 2

Answer:

Light travels slower in glass than in air because:

1) density of glass is less than that of air

2) density of glass is greater than that of air.

3) refractive index of air is greater than that of glass.

4) refractive index of air is less than that of glass.

Explanation:

• Light travels slower in glass than in air because- refractive of air is less than that of glass.
• The reason for that is- because light travels slower than in air because as light travels from rarer medium to denser medium.
• And it is because of the change in density of the medium.
• The reason why light bends towards normal when it passes from rarer medium to denser medium.
• As we know the refractive index of air is $1$ and the refractive index of glass is $1.5$.
• So from the given options, options 1, 2 and 3 says-1
• 1) density of glass is less than that of air
• 2) density of glass is greater than that of air.
• 3) refractive index of air is greater than that of glass.

So this is not true,

• Therefore option 4 is correct.

Hence, option number 4 is correct.

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