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Principal focus of concave lens:...

Principal focus of concave lens:

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Rays travelling parallel to the principal axis of a concave lens diverge after refraction in such a way that they appear to be coming out of a point on the principal axis. This point is called the principal focus of the concave lens.
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Principal focus of convex lens:

The principal focus of a convex lens is virtual . True/False

Knowledge Check

  • A ray of light passing through the principal focus of a convex lens after refraction

    A
    passes through the optic centre.
    B
    emerges parallel to the principal axis.
    C
    emerges without any deviation.
    D
    None of these

  • If an object is placed at the principal focus of a convex lens, the image formed is real, inverted and

    A
    magnified
    B
    diminished
    C
    of same size as that of object
    D
    highly magnified.

  • If an object is placed at the principal focus of a convex lens, the image formed is real, inverted and

    A
    magnified
    B
    diminished
    C
    of same size as that of object
    D
    highly magnified.

    • Similar Questions

    Explore conceptually related problems

    Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed : (i) between optical centre and principal focus of a convex lens. (ii) anywhere in front of a concave lens. (iii) at 2F of a convex lens. State the signs and values of magnifications in the above mentioned cases (i) and (ii).

    a) Explain with the help of a diagram, why the concave lens is also called a diverging lens. b) Define the principle focus of a convex lens.

    A beam of light travelling parallel to the principal axis of a concave lens appears to diverge from a point 20 cm behind the lens after after passing through the lens. Find the power of the lens.

    Define principal focus of a lens.

    An object placed at a distance of a 9cm from the first principal focus of a convex lens produces a real image at a distance of 25cm. from its second principal focus. then the focal length of the lens is :

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