Physics, asked by Nagayya223, 1 year ago

If a child using spectacle with the power of -0.5D. What is focal length use in his spectacle ?

Answers

Answered by InfinityMUPA

WKT, P=1/f
Then , -0.5 f = 1
f = 1/ -0.5 = -2m ..... (as power is always calculated in meters )
hence , the boys uses spectacles with focal length of -2m (or) -200 cm

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