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What is a single lense?

Answer 1

A single lense is just one piece of glass (or other material), bounded by at least one curved surface.

The majority of "lenses" used in photography, as well as other optical devices, consist of several glass pieces; in reality, they should be referred to as objectives (or oculars if used at the eye-side of a telescope, for example).

Because a single lens will never produce an ideal image due to its various aberrations, lenses are frequently combined.

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Answer 2

Amelia Adams

A single lens, or a singlet, is a lens that has only one optical surface. It can be either convex (bulging outwards) or concave (curving inward). Single lenses are used in various optical instruments, such as cameras, microscopes, and eyeglasses, to focus or diverge light rays.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.