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A convex lens is placed in water. a. ...

A convex lens is placed in water.
a. Will there be any change in its focal length? B. Give reason.

Text Solution

Verified by Experts

There will be an increases in the focal length of the convex lens. This is because the refractive index of glass with respect to water is less than the refractive index of glass with respect to air.
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Knowledge Check

  • Assertion: If a convex lens is placed in water, its convergence power decrease. Reason: Focal length of lens is independent of refractive index of the medium.

    A
    If both the assertion and the reason are true and the reason is the correct explanation of assertion.
    B
    If both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.
    C
    Assertion is true, but the reason is false.
    D
    Assertion is false , but the reason is true.

  • Power of a lens - 4D , then its focal length is ……….

    A
    4m
    B
    `-40m`
    C
    `-0.25m`
    D
    `-2.5m`

  • Power of a lens is -4D, then its focal length is

    A
    4 m
    B
    `-40m`
    C
    `-0.25 m`
    D
    `-2.5m`

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    The power of convex lens with focal length 40 cm is …………

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    While doing an experiment for the determination of focal length of a convex lens, Raja Suddenly dropped the lens. It got broken into two halves along the axis. If he continues his experiment with the same lens, Is there any change in the focal length ?

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    Which part of the human eye changes the focal length of the eye lens?

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