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A concave mirror of focal length f (in a...

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`

Text Solution

Verified by Experts

The correct Answer is:
A
On immersing a mirror in water, focal length of the mirror remains unchanged as medium does not affect the focal length of a mirror.
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Knowledge Check

  • 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`

  • The focal length of a plane mirror is

    A
    positive
    B
    negative
    C
    zero
    D
    infinity

  • The focal length of a plane mirror is

    A
    0
    B
    `oo`
    C
    It does not have a focal length
    D
    None of the above

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