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Define the principal focus of a concave ...

Define the principal focus of a concave mirror.

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Principal focus (P.F.) is a point on principal axis of a concave mirror where the rays parallel to principal axis meet after reflection from the mirror.
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Define the principal focus of a lens.

Draw ray diagram to shown the principal focus of a (i) concave mirror, (ii) convex mirror.

Knowledge Check

  • The focus of a concave mirror is:

    A
    real
    B
    Virtual
    C
    undefined
    D
    at the pole

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    Define the principal focus of a spherical mirror.

    Define principal focus of a lens.

    Draw the course of a rays for tracing image of an object held between pole and principal focus of a concave mirror. State the position and nature of image formed. or Draw the course of rays for tracing image of an object held between optical centre and principal focus of a convex lens. State the nature of image formed.

    What do you mean by principal focus of a concave mirror ?

    Define principal focus.

    Principal focus of concave lens:

    A spherical mirror in which reflecting surface is towards the centre of the sphere of which the mirror is a part, is called concave mirror, i.e., reflection of light for this mirror occurs at concave surface or bent-in surface. The rays of light incident on concave mirror in a direction parallel to the principal axis, actually meet at a single point F on the principal axis of the mirror. This point is called principal focus of the mirror. Read the above passage and answer the following questions : (i) Is principal focus of a concave mirror, a real point or a virtual point? (ii) What happens in case of a convex mirror ? (iii) Our teachers and parents advise us to stay focussed. What does it imply?

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