A concave mirror forms a real image of height 4cm of an object of height 1cm placed 20cm away from the mirror: a) proof how it's focal length is 16cm?
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Magnification = h of image/ h of object= -v/u
-4/+1 = -v/20
-v= -4 * 20
So v=80 cm
Now
-4/+1 = -v/20
-v= -4 * 20
So v=80 cm
Now
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