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i) An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm.
At what distance from t

By Parker

i) An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm.
At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained?
Find the size and the nature of the image.
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Parker

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2 thoughts on “i) An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. <br />At what distance from t”

  2. Explanation:

    size of object, o=+7cm

    distance of object ,u=−27cm

    focal length of concave mirror, f=−18cm

    let us take size of image=I

    so, mirror formula is

    v

    1

    +

    u

    1

    =

    f

    1

    so, putting values of u and v,

    v

    1

    =

    −18

    1

    −

    −27

    1

    v

    1

    =

    −54

    1

    v=−54cm

    so, image is formed on object side only.

    magnification,

    m=

    u

    −v

    =

    o

    I

    m=−

    −27

    −54

    =

    7

    I

    I=−14cm

    so, image is double in size to that of object.

    Nature: real, inverted and magnified image.

    Reply

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