CameraIcon

SearchIcon

MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Chromatic Aberrations

Will focal le...

Question

Will focal length of a lens for a red light be more, same or less than that for a blue light?

Open in App

Solution

If you are talking about focal lenth of a lens, then remember that focal length of a lens for a particular color of light depends upon the refractive index of the material of the lens. And refractive index is inversely proportional to the wavelenth of light. Also, in case of a lens, large the value of refractive index shorter is the focal length. Since wavelenth of red light is more than that of blue light, focal length for red light will be more than that for blue light.

Suggest Corrections

thumbs-up

10

Similar questions

Q. When monochromatic red light is used instead of blue light in a convex lens, its focal length will:

Q. Assertion :When a white light is passed through a lens, violet light is more refracted than red light. Reason: Focal length for red light is greater than violet.

f_{B}

f_{R}

are focal lengths of a convex lens for blue and red light respectively and

F_{B}

F_{R}

are the focal lengths of the concave lens for blue and red light respectively. We must then have :

Q. When red light is passing through a covex lens is replaced by light of blue colour , then how will the focal length of the lens change ??????

Q. The critical angle for glass-air is

45^{o}

for the light of yellow colour. State whether it will be less than, equal to, or more than

45^{o}

for blue light?

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Defects in Images

PHYSICS

Watch in App

explore_more_icon

Explore more

Chromatic Aberrations

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon