Question

how do you find the focal length of a concave mirror in the lab? Write relation between focal length and radius of curvature.​

Answer 1

As the distance between the pole 0 of the concave mirror and the focus F is the focal length of the concave mirror. Thus, the focal length of a concave mirror can be estimated by obtaining a real image of a distant object at its focus.The relation between focal length (f) and radius of curvature (R) of a spherical mirror is that the focal length is equal to half of the radius of curvature i.e. f=R2.

Answer 2

Answer:

How to find focal length of concave mirror?

Following are the ways to obtain the focal length of the concave mirror:

A concave mirror is defined as the spherical mirror whose reflecting surface is curved inwards and follows laws of reflection of light.

The light rays coming from a distant object can be considered to be parallel to each other.

If the image formed is real, inverted and very small in size, then the parallel rays of light meet the point in the front of the mirror.

The image formed by the convex lens is real and can be obtained on the screen.

f is used to denote the difference between the principal axis P and the focus F of the concave mirror.

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