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A convex lens is said to have a real foc...

A convex lens is said to have a real focus and a concave lens a virtual focus. Explain.

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Knowledge Check

  • A convex lens of focal length 0.5 m and a concave lens of focal length 1 m are combined.The power of the resulting lens is

    A
    `1D`
    B
    `-1D`
    C
    `0.5D`
    D
    `-0.5D`

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    When an object is placed at a distance 6 cm from a concave lens a virtual image is formed at a distance 4cm from it. Find the focal length of the lens.

    A concave lens is also called a converging/diverginvg lens.

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

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