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A concave lens produces an image 20cm from the lens of an object placed 30cm form the lens calculate the power of the lens
Asked by Satish.ouc | 15 Jul, 2018, 10:21: AM
answered-by-expert Expert Answer
We have lens formula begin mathsize 12px style 1 over v minus 1 over u equals 1 over f end style, where v = lense-to-image distance = 20 cm and
u = lense-to-object distance = -30 (sign convention)

hence  begin mathsize 12px style 1 over f space equals space 1 over 20 plus 1 over 30 equals fraction numerator 3 plus 2 over denominator 60 end fraction equals 1 over 12 end style,   then f = 12 cm , power = 100/12 = +8.33
Answered by Thiyagarajan K | 15 Jul, 2018, 10:53: AM

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