Optician has prescribed corrective lens indicating-0.4D.This means the lens prescribed is convex?True or false
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Optician has prescribed corrective lens indicating-0.4D.This means the lens prescribed is convex?True or false
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TRUE IS THE RIGHT ANSWER.......
False
Power of convex lens is positive and that of a concave lens is negative.
hence if power is negative this means focal length is negative and we have a diverging lens.
so the prescribed corrective lens is concave lens.