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2. Infinity mirror - Wikipedia

   en.wikipedia.org/wiki/Infinity_mirror

   An infinity mirror effect viewed between paired mirrors in a public bathroom. The infinity mirror (also sometimes called an infinite mirror) is a configuration of two or more parallel or angled mirrors, which are arranged to create a series of smaller and smaller reflections that appear to recede to infinity. [1][2] Often the front mirror of an ...

3. Penrose triangle - Wikipedia

   en.wikipedia.org/wiki/Penrose_triangle

   Penrose triangle. Penrose triangle. The Penrose triangle, also known as the Penrose tribar, the impossible tribar, [1] or the impossible triangle, [2] is a triangular impossible object, an optical illusion consisting of an object which can be depicted in a perspective drawing. It cannot exist as a solid object in ordinary three-dimensional ...

4. Circle of confusion - Wikipedia

   en.wikipedia.org/wiki/Circle_of_confusion

   Circle-of-confusion calculations: An early precursor to depth of field calculations is the TH (1866, p. 138) calculation of a circle-of-confusion diameter from a subject distance, for a lens focused at infinity; this article was pointed out by von Rohr (1899). The formula he comes up with for what he terms "the indistinctness" is equivalent, in ...

5. Optical illusion - Wikipedia

   en.wikipedia.org/wiki/Optical_illusion

   Optical illusion is also used in film by the technique of forced perspective. Op art is a style of art that uses optical illusions to create an impression of movement, or hidden images and patterns. Trompe-l'œil uses realistic imagery to create the optical illusion that depicted objects exist in three dimensions.

6. Hyperfocal distance - Wikipedia

   en.wikipedia.org/wiki/Hyperfocal_distance

   In optics and photography, hyperfocal distance is a distance from a lens beyond which all objects can be brought into an "acceptable" focus. As the hyperfocal distance is the focus distance giving the maximum depth of field, it is the most desirable distance to set the focus of a fixed-focus camera. [1] The hyperfocal distance is entirely ...

7. Numerical aperture - Wikipedia

   en.wikipedia.org/wiki/Numerical_aperture

   Instead, the angular aperture of a lens (or an imaging mirror) is expressed by the f-number, written f /N, where N is the f-number given by the ratio of the focal length f to the diameter of the entrance pupil D: =. This ratio is related to the image-space numerical aperture when the lens is focused at infinity. [3]