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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.

6 years ago


Answers : (1)


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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6 years ago

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