A person can see clearly only upto a distance of 25cm. He wants to read a book placed at a distance of 50cm find nature, focal length and power lens required for his spectacles
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person need lense of 2 diopters..
mean that the power is 2 D
mean that the power is 2 D
chayagowda249chaya:
explain briefly it is for 3 marks
ya
Power=1/f. ( where f is the focallength of the lense).50cm=0.5m.
then 1 m=1diopter so 0.5 m =? :. 0.5m=0.5 diopter
1/2 D =50 cm
p=1/f. 1/2=1/50 therfore the answer is 2 diopter for 50 cm docal length
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