Do The Focal Lengths Of Lens And Mirror Depend On The Colour Of Light Ray?

Question

Do the focal lengths of lens and mirror depend on the colour of light ray?

Solution

Focal length of a lens depends on the colour of the light used. It is greatest for red light and least for violet light. The focal length of mirror does not depend on colour since laws of reflection are not influenced by colour of light used.

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Q- A swimmer sees only hazy contours of objects when he opens his eyes under water, while they are distinct when using a mask. Why?

Chapter: Light

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Q- The image of an object formed by a convex is obtained on a screen. Will the full size of image be obtained if the lower half of the is made completely opaque?

Question

Do the focal lengths of lens and mirror depend on the colour of light ray?

Solution

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Related Question

Q- A swimmer sees only hazy contours of objects when he opens his eyes under water, while they are distinct when using a mask. Why?

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Q- The image of an object formed by a convex is obtained on a screen. Will the full size of image be obtained if the lower half of the is made completely opaque?

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Q- A concave lens is used in spectacles to correct myopia-Why?

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