Question

as light travels from a rarer medium to a denser medium it will have
a) increase velocity
b) decreased velocity
c) decreased wavelength
d) both a and b​

Answer 1

Answer:

b) Decreased velocity

Take example of air and water to clear your concept

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Answer 2

As light travels from a rarer medium to a denser medium it will have b) decreased velocity.

Why happens when light travels from rarer medium to denser medium?

• A phenomenon called refraction of light takes place when there is medium change in the path of light propagation.
• Refraction is the particle property of light according to which ray of light bend towards or away from normal depending on the density of medium.

What is normal?

• A line perpendicular to the interface of two different mediums.

So, light ray travelling from rarer medium to denser medium, it will bend towards the normal because the speed of light is less in denser medium than rarer medium.