If the focal length of a lens is -20cm. fine the nature and the power of lens. If that lens is combined with
another lens of power -5D. Find the combined power of these two lenses.
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Explanation:
f = 1/1.5 = 2/3 = + 0.67 m. The focal length is + 0.67m. The nature of lens is converging type or convex lens. The defect of the eye is Hyperopia or far-sightedness.
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