Dikshu uses spectacle to remove his defect of eye having power -0.5 D. What type of lens has he used , focal length of the lens, defect of vision.
1 Answer
power of lens used is negative, that means dikshu has used a concave lens.
here, power p = -0.5 D
focal length f = ?
according to formula,
p =1/f
-0.5 = 1/ f
f = 1/ -0.5
f = -2 m
f = -200 cm
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