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A concave mirror of 20 cm focal length i...

A concave mirror of 20 cm focal length is immersed into water. What is its new focal length ?

Text Solution

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Focal length of concave mirror even in water is same at 20 cm.
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Knowledge Check

  • A concave mirror of focal length f (in air) is immersed in water ( mu = 4/3). The focal length of the mirror in water will be

    A
    `(f)/(3)`
    B
    `(f)/(2)`
    C
    `(3f)/(4)`
    D
    `f`

  • A concave mirror of focal length f (in air) is immersed in water (mu=4//3) . The focal length of the mirror in water will be

    A
    `f`
    B
    `4/3 f`
    C
    `3/4 f`
    D
    `7/3 f`

  • A convex mirror of focal length f (in air) is immersed in water (mu = 4/3) . The focal length of the mirror in water will be -

    A
    `f`
    B
    `(4/3)f`
    C
    `(3/4)f`
    D
    `(7/3)f`

    • Similar Questions

    Explore conceptually related problems

    A concave mirror and convex lens are immersed in water. What change, if any, do you expect in the focal length of the two?

    For a concave mirror of focal length 20 cm, match the following

    If a convex lens is immersed in water, then its focal length

    A concave mirror of focal length f, in air, is immersed in water of refractive index (4)/(3) . The focal length of the mirror in water will be

    An object placed at 20cm in front of a concave mirror produces three times magnified real image. What is the focal length of the concave mirror?

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