A person needs a lens of power minus 2.5 dioptres for correcting his vision name the defect of vision he is suffering from which lens will be using for the correction? Also find the focal length of the lens
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p = +2.5D
When power of lens is positive the LENS IS A CONVEX LENS.
CONVEX LENS is used for correction SHORT-EYE-SIGHTEDNESS .
∵ P = 1/f(in meters)
⇒ 2.5 = 1/f
⇒ f = 1/2.5
⇒ f = 0.4 meters
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