Question

sign convention for lens

Answer 1

Lenses bend light that passes through them. The direction and amount that the light bends depends on the curvature of the lens, the material the lens is made of, and the material in which the lens is immersed (for now, we’ll assume this is just air). If both sides of the lens curve outward, it is called a converging lens, and it will bend light from distant objects inwards toward a single point, called the focal point.

Answer 2

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