Question

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70. How can we differentiate between convex and concave lenses without touching them.
ns. Keep the lens close to the printed page of the book and observe the image of the prin
through the lens. If the printed letters appear enlarged, then the lens is convex and if th​

Answer 1

Answer:

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Answer 2

Answer:

Concave lens reflecting surface curved inwards

Convex lens reflecting surface curved outwards