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Find the power of a concave lens of foca...

Find the power of a concave lens of focal length 2m

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Focal length of concave lens, f= 2 m power of lens, P=1/f= 1/ (-2) = -0.5 D
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Find the power of a concave lens of focal length 2 m.

Find the power of a concave lens of focal length 2 m.

Knowledge Check

  • The power of a concave lens of focal length 50 cm is :

    A
    `+2D`
    B
    `+0.02 D`
    C
    `-0.02 D`
    D
    `-2 D`

  • The power of a concave lens of focal length 50 cm is :

    A
    `+2D`
    B
    `+0.02 D`
    C
    `-0.02 D`
    D
    `-2 D`

  • A parallel beam is incident on concave lens of focal length. If is then put in contact with a concave lens of focal length f/2. What will pappen to the image ?

    A
    Real, at v = f/2
    B
    Real, at v = f
    C
    Virtual, at v = f/2
    D
    Virtual, at v = f.

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    What is the focal length of a convex lens of focal length 30cm in contact with a concave lens of focal length 20cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.

    A beam of light converges to a point P. A lens is placed is the path of convergent beam 12cm from the point P. At what point the beam converges if the lens is a concave lens of focal length 16cm a convex length of focal length 20cm

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    A convex lens of focal length 25 cm is placed coaxially in contact with a concave lens of focal length 20 cm. Determine the power of the combination. Will the system be converging or diverging in nature?

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