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Find the focal length of a convex lens w...

Find the focal length of a convex lens which produces a real image at 60 cm from the lens when an object is placed at 40 cm in front of the lens.

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24 cm
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Knowledge Check

  • An optical system consists of a thin convex lens of focal length 30 cm and a plane mirror placed 15 cm behind the lens. An object is placed 15 cm in front of the lens. The distance of the final image from the object is

    A
    `60 cm`
    B
    `30 cm`
    C
    `75 cm`
    D
    `45 cm`

  • A convex lens of focal length f produces a real image m times the size of an object, then the distance of the object from the lens is

    A
    (m + 1)f
    B
    (m - 1)f
    C
    `((m+1)/m)f`
    D
    `((m-1)/m)f`

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    The optical system consișt of a thin convex lens of focal length 30cm and a plane mirror 15 cm behind the lens. An object is placed 15cm in front of the lens. The distance (in cm ) of final image from the lens is

    A concave lens is placed in contact with a convex lens of focal length 25 cm . The combination produces a real image at a distance of 80 cm , when an object is at a distance of 40 cm . What is the focal length of concave lens ?

    An object is kept at 60 cm in front of a convex lens. Its real image is formed at 20 cm from the lens . Find the focal length and power of the lens.

    An object is kept at 20 cm in front of a convex lens and its real image is formed at 60 cm from the lens . Find The focal length and power of the lens .

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