20. A person uses a lens of power + 3D to normalise vision. Which lens it refers to? a) Concave lens b) Plane concave lens c) Convex lens d) Concave - convex lens
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Answer: Option (C) Convex Lens
Explanation:
'+' sign represents the lens is convex
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Answer:
c) Convex lens
Explanation:
A person uses a lens of power + 3D to normalise vision. Which lens it refers to Convex lens.
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