Aconverging mirror forms a real image of height 4cm of an object of height 1cm placed 20cm away from the mirror. Calculate the image distance. What is the focal Length of the mirror?
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height of image / height of object = -v/u
4/1 = -(-v)/-20
v = -80cm
the image distance is -80cm in front of mirror..
use mirror formula to find focal length..
1/f = 1/v + 1/u
1/f = 1/-80 - 1/20
1/f = (-1 -4)/80
1/f = -5/80
f = - 16cm
thus the focal Length of the mirror is -16cm
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