which lens is used in glasses of a student who has difficulty in reading letter writer on a blackboard ?
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Answer:
Concave lens
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Explanation:
Convex and Concave Lenses Used in Eyeglasses
Lenses may be divided broadly into two main types: convex and concave. Lenses that are thicker at their centers than at their edges are convex, while those that are thicker around their edges are concave.
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