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Define following for curved mirrors (1) ...

Define following for curved mirrors (1) Radius of curvature (2) Centre of curvature (3) Pole (4) Principle axis (5) Aperture (6) Principle focus (7) Focal plane (8) Focal length (9) Paraxial Rays

Text Solution

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Radius of Curvature (R) : The radius of the spherical shell from which the mirror is made is called the radius of curvature of curved mirror.

Centre of Curvature (C): The centre of the spherical shell is called the centre of curvature (C) of the mirror.
Pole (P): The centre of the reflecting surface of a mirror is called pole (P).
Principal Axis : The imaginary line passing through the pole and the centre of curvature (CP) is called the principal axis of the mirror.
Aperture : The diameter of the reflecting surface (QQ.) is called aperture of the mirror.
Principal Focus (F) : The point where the rays parallel to the principal axis meet (concave mirror), or appear to meet (convex mirror), after reflection is called the principal focus of the mirror.
Radial Aperture :

Focal Plane : A plane passing through the principal focus and normal to the principal axis is called the focal plane of the mirror.
Focal Length (F) : The distance between the pole and the principal focus of a mirror is called focal length.
Paraxial Rays : Rays close to the principal axis are called paraxial rays.
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For more information about thin spherical lens, define : (a) First principal focus (F_1) (b) Second principal focus (F_2) (c) Optical centre (C) (d) Focal length (f)

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Knowledge Check

  • If radius of curvature of curved surface of plano-convex lens of refractive index 1.5 is 60 cm, then its focal length is ...... cm.

    A
    `-60`
    B
    `120`
    C
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    D
    `-120`

  • Radius of curvature of a convex curved surface is 50 cm. If refractive index of medium is 1.5, then find 1st and 2nd focal length.

    A
    -100 cm, 150 cm
    B
    -150 cm, 100 cm
    C
    100 cm, -150 cm
    D
    150 cm, -100 cm

  • Focal lens of plane convex lens (mu=3/2) is f and radius of curvature of curved surface is R. So write the relation between f and R.

    A
    f=R
    B
    f=`R/2`
    C
    f=2R
    D
    f=`(3R)/(2)`

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