An object is placed in front of converging lens at a distance of 20cm if real image is formed at a distance of 30cm from the lens calculate focal length of the lens and its power
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1/f=1/v-1/u
1/f = 1/30-1/-20
= 5/60= 1/12
f=12cm
1/f = 1/30-1/-20
= 5/60= 1/12
f=12cm
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