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A small object is so placed in front of ...

A small object is so placed in front of a convex lens of 5cm focal length that a virtual image is formed at a distance of 25 cm. Find the magnification.

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An object is placed in front of a concave mirror at a distance of 7.5 cm from it. If the real image is formed at a distance of 30 cm from the mirror, find the focal length of the mirror. What would be the focal length if the image is virtual.

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Knowledge Check

  • An object is placed 25 cm in front of a concave lens of focal length 25 cm. The position of images is

    A
    - 10 cm
    B
    + 10 cm
    C
    - 12 . 5 cm
    D
    12 . 5 cm

  • An object of height 1.5 cm is placed on the axis of a convex lens of focal length 25 cm . A real image is formed at a distance of 75 cm from the lens. The size of the image will be

    A
    4.5 cm
    B
    3.0 cm
    C
    0.75 cm
    D
    0.5 cm

  • An object placed 10 cm in front of a convex lens of focal length 15 cm. The image produced will be

    A
    a Real and magnified
    B
    b Virtual and magnified
    C
    c Virtual and reduced in size
    D
    d Real and reduced in size

    • Similar Questions

    Explore conceptually related problems

    An object 25 cm high is placed in front of a convex lens of focal length 30 cm . If the height of image formed is 50 cm , find the distance between the object and the image (real and virtual)?

    An object 2.5 cm high is placed in front of a convex lens of focal length 30 cm. If the height of image formed is 5 cm, find the distance between the object and the image?

    An object of height 5 cm is placed in front of a convex lens of focal length 20 mc at a distance of 30 cm. What is the height of the image (in cm)?

    If an object is placed at 50 cm from a convex lens of focal length 25 cm , what will be the image distance ?

    An object of height 5 cm is placed in front of a convex lens of focal length 20 cm at a distance of 30 cm. What is the height of the image (in cm)?

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