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Will the focal length be longer or shorter in a less curved converging mirror when...

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vanessa0918 | Student | eNoter

Posted June 9, 2013 at 3:56 AM via web

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Will the focal length be longer or shorter in a less curved converging mirror when compared to a more curved mirror?

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llltkl | College Teacher | Valedictorian

Posted June 9, 2013 at 4:46 AM (Answer #1)

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A concave mirror is called a converging mirror because a parallel beam of rays incident on a concave mirror converges after being reflected through it.

For a spherical mirror of small aperture, focal length (f) is half the radius of curvature (R).

f = R/2,

`rArr`  R = 2f

This relationship is true for both concave and convex mirrors.

Higher the radius of curvature of a mirror, longer is the focal length and lesser is the magnification of the image with respect to the object size.

Thus for a less curved converging mirror, the focal length will be shorter when compared to a more curved mirror.

Sources:

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vanessa0918 | Student | eNoter

Posted June 9, 2013 at 4:58 AM (Answer #2)

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oic, thanks for answering

 

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