The nature of eye lens in human being is (1) Biconvex lens of fixed focal length (2) Biconvex lens of variable focal length (3) Biconcave lens of fixed focal length (4) Biconcave lens of variable focal length
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Explanation:
A concave lens diverge the light rays and increase the focal length whereas a convex lens converge the light rays and decrease the focal length.
If the lens is curved at one face, it may be concave or convex and if curved at both faces, it may be biconcave or biconvex.
Eye lens is a transparent crystalline structure present in eye ball and held in place by the ligaments attached to ciliary body. It is biconvex i.e. convex faces from both sides.
So, the correct answer is 'Biconvex'
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