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.6. (a) Define "power of accommodation of eye"(b) A person uses a lens of power -2.0D for correcting his distant vision. Porcorrecting his near vision he uses a lens of power +1.5D. What is the focal length ofthe lenses required to correct this disorder?(3M) |
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Answer» (a) The process by which the ciliary muscles change the focal length of an eye lens to focus distant or near objects clearly on the retina is called the power of accommodation of the eye. (b) For the first one P = -2.0D And we know that,P= 1/ f Therefore, f = 1/ P = 1/ -2.0 = -0.5m = -0.5 ×100 = -50 cmThis is a concave lens. Now for the second oneP = 1.5DP= 1/ f f = 1/ P = 1/ 1.5 = 2/3 × 100 = 66.6 cmThis is a convex lens. |
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