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The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

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The radius of curvature of a sperical mirror is 20 cm. What is its focal length ?

For a spherical mirror, (1)/(v) + 1/u = (1)/(f) =2/R , where u= distance of object from pole of mirror v= distance of image from pole of mirror f= focal length of mirror R= radius of curvature of mirror. This formula is known as mirror formula. It is applicable equally to convex mirror as well as concave mirror. Read the above passage and answer the following questions : (i) When we change u by moving the object, how is focal length f, affected? (ii) The radius of curvature of a spherical mirror is 40 cm. What is its focal length? (iii) Focal lenght of a mirror depends neither on u, nor on v. It depends only on radius of curvature of the mirror. What values of life do you learn from this fact?

Knowledge Check

  • The radius of curvature of a spherical mirror is equal to _____.

    A
    f-2
    B
    2f
    C
    f+2
    D
    f/2

  • The radius of curvature of a mirror is 20 cm focal length is :

    A
    20 cm
    B
    10 cm
    C
    40 cm
    D
    5 cm

  • If the radius of curvature of a convex mirror is 40 cm, then its focal length is

    A
    -20 cm
    B
    20 cm
    C
    40 cm
    D
    -40 cm

    • Similar Questions

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    Define the radius of curvature of spherical mirrors. Find the nature and focal length of a spherical mirror whose radius of curvature is + 24 cm.

    If R is the radius of curvature of a spherical mirror and f is its length, then :

    The radius of curvature of a concave mirror is 15 cm. Its focal length will be

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