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When two colours of light ( $X$ and $Y$ ) are sent through a glass prism, $X$ is bent more than $Y$ . Which of the following travels more slowly in the prism?

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X

light ray

Y

light ray

Both

1

and

2

None of these

answer is A.

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Detailed Solution

When two colours of light (

X

and

Y

) are sent through a glass prism,

X

is bent more than

Y

. Then

X

light ray travels more slowly in the prism.
The

X

-ray bent more than the

Y

-ray soit can be concluded that the

X

-ray has a maximum refractive index. When two light rays (

X

and

Y

) are passed through the prism both light rays will deviate, but in this, as the

X

light ray deviates more than the

Y

light ray, which means that the

X

light ray has the maximum refractive index and its travelling speed is very low as the velocity of a light ray is inversely proportional to its refractive index and directly proportional to its optical density when passes through any medium.

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