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The focal length of a spherical mirror i...

The focal length of a spherical mirror is given by` f=R/2` , where R is radius of curvature of the mirror. For a given spherical mirror made of steel the focal length is f = 24.0 cm. Find its new focal length if temperature increases by `50^(@)C`. Given = `alpha_("Steel")=1.2 xx 10^(- 5).^(@)C^(-1)`

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The correct Answer is:
24.01444 cm
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Knowledge Check

  • If the focal length of a spherical mirror is 12.5 less cm, its radius of curvature will be :

    A
    25 cm
    B
    15 cm
    C
    20 cm
    D
    35 cm

  • The focal length (f) of a spherical mirror of radius of curvature R is

    A
    R
    B
    `R/2`
    C
    `(3R)/2`
    D
    2R

  • The focal length of a spherical mirror of radius of curvature 30 cm is:

    A
    10 cm
    B
    15 cm
    C
    20 cm
    D
    30 cm

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