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What is the lens?

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What is the lens?

(a) An image – forming device

(b) An image – producing device

(c) An image – reflecting device

(d) An object – reflecting device

I have been asked this question in quiz.

This is a very interesting question from Lenses topic in portion Optics of Engineering Physics II

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The correct answer is (a) An image – forming device

For explanation I would say: A lens is an image- forming device. They form an image by refraction of light at its two bounding surfaces.

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