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# when a ray of light passes from a denser to rarer medium which angle is greater

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## [Solved] When a light ray passes from a rarer medium to a denser medi

CONCEPT: Refraction: When a ray of light passes from one medium to another it suffers a change in direction at the boundary of two m

Home Physics Optics Refraction and Reflection

## Question

When a light ray passes from a rarer medium to a denser medium, _______ because the light ray bends towards the normal

the angle of incidence is less than or equal to the angle of refraction,

the angle of incidence is less than the angle of refraction,

the angle of incidence is greater than the angle of refraction,

the angle of incidence is equal to the angle of refraction,

Option 3 : the angle of incidence is greater than the angle of refraction,

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## Detailed Solution

CONCEPT:

Refraction: When a ray of light passes from one medium to another it suffers a change in direction at the boundary of two media is called refraction.

The change in direction is because the speed of light travels at different speeds in different mediums. The Refractive Index of a medium defines that it is denser or rarer

Snell’s law of refraction: “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given colour and for the given pair of media”. ​

Sin iSin r= μ2μ1=constant

Where μ 2 and μ 1 are the refractive indexes of the two mediums 2 and 1 respectively.

The angle of refraction for the different conditions can be expressed as

When a light ray passes from a rarer medium to a denser medium, the angle of incidence is greater than the angle of refraction, because the light ray bends towards the normal.

When a light ray passes from a denser medium to a rarer medium, the angle of incidence is smaller than the angle of refraction, because the light ray bends away from the normal.

EXPLANATION:

The refraction of light takes place on going from one medium to another because the speed of light is different in the two media.

And in our condition, when a light ray passes from a rarer medium to a denser medium, the angle of incidence is greater than the angle of refraction, because the light ray bends towards the normal.

Hence option 3 is correct among all

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स्रोत : testbook.com

## When light goes from denser to rarer medium the angle of refraction is:A) More than the angle of incidenceB) Less than the angle of incidenceC) Equal to the angle of incidenceD) Critical angle

When light goes from denser to rarer medium the angle of refraction is:A) More than the angle of incidenceB) Less than the angle of incidenceC) Equal to the angle of incidenceD) Critical angle. Ans: Hint: When light travels in rarer medium, the speed...

When light goes from denser to rarer medium the angle of refraction is:

A) More than the angle of incidence

B) Less than the angle of incidence

C) Equal to the angle of incidence

D) Critical angle

Last updated date: 12th Mar 2023

• Total views: 256.5k • Views today: 3.37k Answer Verified 256.5k+ views 2 likes

Hint: When light travels in rarer medium, the speed of light much more than in a denser medium. So, whenever light travels from denser to rarer medium it tends to move away from the normal. Since the speed is more, the light always moves away so to keep rays of light in the same phase. And when light travels from rarer to denser medium it shifts towards the normal.Complete answer:

When a light travels from denser to rarer medium the angle of refraction is more than the angle of incidence. This is because the speed of light varies from medium to medium. Angle of incidence is the angle which light makes with normal while entering the medium whereas angle of incidence is the angle which light makes with the surface after refraction.

There are two types of medium namely optically rarer medium and optically denser medium. Speed of light is more in the rarer medium than in denser medium. So, whenever light travels from denser to rarer medium light tends to move away from the normal. And when light travels from rarer to denser medium light tends to move towards normal. Also the relative refractive index of the medium is equal to the ratio of speed of light in medium 1 to that of medium 2.

μ= v 1 v 2 μ=v1v2 where, μ μ

=refractive index of medium

The angle of incidence is only equal to the angle of refraction only when light enters perpendicular to the surface of the medium.

Note: When speed of light becomes less after refraction, light tilts towards the normal, and when speed becomes more after refraction then light bends away from the normal. It is the phenomenon of refraction that light always bends when it travels from one medium to another having different optical density.

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