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For a spherical mirror, `(1)/(v) + 1/u = (1)/(f) =2/R`, where
`u=` distance of object from pole of mirror
`v=` distance of image from pole of mirror
`f=` focal length of mirror
`R=` radius of curvature of mirror.
This formula is known as mirror formula. It is applicable equally to convex mirror as well as concave mirror.
Read the above passage and answer the following questions :
(i) When we change u by moving the object, how is focal length f, affected?
(ii) The radius of curvature of a spherical mirror is 40 cm. What is its focal length?
(iii) Focal lenght of a mirror depends neither on u, nor on v. It depends only on radius of curvature of the mirror. What values of life do you learn from this fact?

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(i) When we change u, by moving the object, distance of image v changes. But focal length of mirror, i.e., f is not affected.
(ii) Here, `R=40cm`, `f=R/2 =40/2 = 20`cm.
(iii) In day to day life, an object is like a situation that comes up and image is like the response we give to it. We are like a mirror. Our nature/curvature determines our focal length. Response to a particular situation will depend upon our nature. One the contray, our nature/focal length is not affected by the situation that comes up.

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