Question

Define radius of curvature and focal length

Answer 1

Answer:

the radius of the sphere of which the given mirror is a part is known as radius of curvature

the distance between the Pole and the focus of the mirror is known as it's focal length

Answer 2

Answer:

Radius of curvature lens :

the radius of two imaginary spheres of which the lens is a part are called radius of curvature. a lens has 2 radii of curvatures.... these may to another be equal.

radius of curvature mirror :

it is the radius of imaginary sphere of which mirror is a part. represented by R

focal length lens :

the distance between principal focus and optical centre of lens.

focal length mirror :

the distance between pole and principal focus of a spherical mirror is called focal length of mirror. Represented by f. if the aperture of the mirror is small, then f =R/2. It means that the principal focus of a spherical mirror lies midway between the pole and center of curvature

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