Chapter 71 of 2364 min read

Reflection and refraction, mirror and lens formulae

Why this is asked: The biggest source of errors here is sign convention: a concave mirror has negative f, a convex mirror positive f — a convex mirror's image is always virtual and upright regardless of object distance, and getting the sign backwards flips every later answer.

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Test yourself

•In a certain camera, a combination of four similar thin convex lenses is arranged axially in contact. Then the power of the combination and the total magnification, in comparison to the power ( $p$ ) and magnification ( $m$ ) of each lens, will be, respectively:

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