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A pin is placed 10cm in front of a conve...

A pin is placed 10cm in front of a convex lens of focal length 20cm, made of a material having refractive index 1.5 . The surface of lens farther away from the pin is silvered and has a radius of curvature 22cm. Determine the position of the final image. Is the image real or virtual?

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The correct Answer is:
12 cm
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A pin is placed 10 cm in front of a convex lens of focal length 20 cm . The lens is made of material having retive index 1.5 . The surface of the lens farther away from the pin is silvered and has a radius of curvature 22 cm . Determine the position (in cm and only magnițude) of the final image.

An object in placed 30cm in front of a concave lens that is made of a glass of refractive index 1.5 and has equal radii of curvature of its two surfaces, each 30 cm. The surface of the lens farther away from the object is silvered. Find the nature and position of the final image.

Knowledge Check

  • 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

  • A plano-convex lens is made of material having refractive index 1.5. The radius of curvature of curved surface is 60 cm. The focal length of the lens is ______ cm.

    A
    `-60`
    B
    120
    C
    60
    D
    `-120`

  • Find the focal length of plano-convex lens of material having refractive index of 1.5. Radius of curvature of convex surface is 10 cm.

    A
    20 cm
    B
    30cm
    C
    50 cm
    D
    40 cm

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    A glass slab of thickness 2cm and refractive index 2 is placed in contact with a biconvex lens of focal length 20cm. The refractive index of the material of the lens 1.5 . The far side of the lens is silvered. Where should an object be placed in front of the slab so that it images on to itself?

    An object is placed 15 cm in front of a convex lens of focal length 10 cm . Find the nature and position of image formed. Where should a concave mirror of radius of curvature 20 cm be position of the object itself ?

    An object is placed 15 cm in front of a convex lens of focal length 10 cm . Find the nature and position of image formed. Where should a concave mirror of radius of curvature 20 cm be placed so that the final image is formed on the position of the object itself ?

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    A object is placed 20 cm from the convex lens, with focal length 40 cm. The image formed is virtual and erect. What will be power of the lens?

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