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Get Answers to all your Questions
(a) A person is suffering from both myopia and hypermetropia.
(i) What kind of lenses can correct this defect ?
(ii) How are these lenses prepared ?
(b) A person needs a lens of power + 3D for correcting his near vision and –3D for correcting his distant vision. Calculate the focal lengths of the lenses required to correct these defects.
Answers (1)
(a) If a person is suffering from both myopia and hypermetropia.
Bifocal lenses can correct this defect
(ii) These lenses prepared in which Upper part of lens is concave and lower part of the lens is convex.
(b) GIven, P = +3D, f = 1 P = 3 1 m = +100 3 cm = + 33.3 cm, P = - 3D
Therefore, Focal lengths of the lenses required to correct these defects.
f = −100 3 = −33.3 cm
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