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Define the principal focus of a concave ...

Define the principal focus of a concave mirror.

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When light rays, parallel and close to the principal axis, are incident on a concave mirror, after reflection they meet (or converge) to a point on the principal axis of the mirror. This point is called as the Principal focus (F) of the concave mirror. Concave mirror is therefore called a Converging mirror.
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Knowledge Check

  • Show that if 'p' and 'q' are distance of object and image from the principal focus of a concave mirror, then what is relation between p,q and f?

    A
    `pq = sqrt(f)`
    B
    pq = f
    C
    `pq = f^(2)`
    D
    `pq = (1)/(f)`

  • An objected is placed at the principle focus of a convex mirror. The image will be at

    A
    centre of curvature
    B
    principle focus
    C
    infinity
    D
    no image will be formed

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    a) An object is kept between centre of curvature and principal focus of a concave mirror. Write the nature of the image formed. b) Define focal length of a convex mirror. Write the relationship between focal length and radius of curvature of a convex mirror.

    a) An object is kept between centre of curvature and principal focus of a concave mirror. Write the nature of the image formed. b) Define focal length of a convex mirror. Write the relationship between focal length and radius of curvature of a convex mirror.

    a) An object is kept between centre of curvature and principal focus of a concave mirror. Write the nature of the image formed. b) Define focal length of a convex mirror. Write the relationship between focal length and radius of curvature of a convex mirror.

    Draw the ray diagram to construct an image when an object is placed between the principal focus and pole of a concave mirror.

    An object is kept on the principal axis of a concave mirror of focal length 12 cm. If the object is at a distance of 18 cm from the mirror, calculate the image distance. Determine the nature of the image formed by calculating the magnification produced by the mirror.

    An object is kept on the principal axis of a concave mirror of focal length 12 cm. If the object is at a distance of 18 cm from the mirror, calculate the image distance. Determine the nature of the image formed by calculating the magnification produced by the mirror.

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