Question

The refractive index of glass is 1.5.What is the meaning of this statement in
relation to speed of light?
a) Ratio of speed of light in glass to the speed of light in air is equal to 1.5.
b) Ratio of speed of light in air to the speed of light in glass is equal to 1.5.
c) Ratio of speed of light in water to the speed of light in glass is equal to 1.5.
d) Ratio of speed of light in vacuum to the speed of light in glass is equal to 1.5.

Answer 1

Answer:

• b) Ratio of Speed of light to air to the speed of light in glass is equal to 1.5

Explanation:

Solution:-

As we have to find the meaning of refractive index of glass .

As we know that refractive index is defined as the speed of light in air divided by the speed of light in medium (glass).

So , the required answer is Ratio of Speed light in air to the speed of light in air

Additional Information !!

By using this formula you can calculate the refractive index of any medium

Using Snell's Law

• ng = c/v

where,

• ng is the refractive index
• c is the speed of light in air or vacuum
• v is the speed of light in medium

Answer 2

${\rm{\underline{\underline{Answer:-}}}}$

→ The refractive index of glass is 1.5.What is the meaning of this statement in  relation to speed of light?

a) Ratio of speed of light in glass to the speed of light in air is equal to 1.5.

b) Ratio of speed of light in air to the speed of light in glass is equal to 1.5.   $\checkmark$

c) Ratio of speed of light in water to the speed of light in glass is equal to 1.5.

d) Ratio of speed of light in vacuum to the speed of light in glass is equal to 1.5.

${\rm{\underline{\underline{Explanation :-}}}}$

→ The refractive index of glass is 1.5 for white light means white light travels in air 1.5 times faster than in glass.

${\rm{\underline{\underline{More\;to\;know :-}}}}$

→ Index of refraction is defined as :

$\sf \rightarrow ng = \dfrac{c}{v}$

$\sf Where , \\\\ ng = refractive \; index \\\\c = speed \; of \; light \; in \; vaccum \\\\v = speed \; of \; light \; in \; the \; specified \; material$

→ Snell's law :

It is a formula which describes the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.

$\sf \rightarrow snell's \; law : \\\\n_{1} sin \theta _{1} = n_{2} sin \theta _{2}$

_____________

All Done !! :D