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a) An object is kept between centre of c...

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.

Text Solution

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(a)
Real and inverted
(b) The distance between the pole and the principal focus of a convex mirror is called the focal length of a convex mirror.
The relationship between focal length and radius of curvature of a convex mirror.
The radius of curvature is found to be equal to twice the focal length.
R=2f
This implies that the principal focus of a spherical mirror lies midway between the pole and centre of curvature.
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Knowledge Check

  • An object is kept at the centre of curvature of a concave mirror. The position and nature of the image formed is

    A
    between F and C and inverted
    B
    behind the mirror and erect
    C
    between F and P and erect
    D
    at the centre of curvature and inverted

  • An object is kept at the centre of curvature of a concave mirror. The position and nature of the image formed is

    A
    between F and C and inverted
    B
    behind the mirror and erect
    C
    between F and P and erect
    D
    at the centre of curvature and inverted

  • 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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