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the distance of an object placed before a concave mirror is 16cm from one focus and distance of its image 100cm from the focus. find the focal length and the magnification of the mirror.

the distance of an object placed before a concave mirror is 16cm from one focus and distance of its image 100cm from the focus. find the focal length and the magnification of the mirror.

Grade:11

1 Answers

Chetan Mandayam Nayakar
312 Points
12 years ago

let f be focal length.  1/(f+16) + 1/(f+100) = 1/f,     upon simplifying, we get f2 = 1600. f>0, thus f=40cm

magnification = u/v = 56/140 =2/5 =0.4

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