the object is kept at 50cm in front of concave mirror. the image is formed at 25cm.what is length of focus for mirror.
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u = -50 cm
v = -25 cm
Using mirrors formula
1/f = 1/v. + 1/u
-1/25 - 1/50
-2-1/50
-3/50
f = - 50/3
f = - 16.66 cm
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