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2. Fermat's principle - Wikipedia

   en.wikipedia.org/wiki/Fermat's_principle

   Fig. 1: Fermat's principle in the case of refraction of light at a flat surface between (say) air and water. Given an object-point A in the air, and an observation point B in the water, the refraction point P is that which minimizes the time taken by the light to travel the path APB.

3. Hamiltonian optics - Wikipedia

   en.wikipedia.org/wiki/Hamiltonian_optics

   An incoming light ray has momentum p A before refraction (below plane x 1 x 2) and momentum p B after refraction (above plane x 1 x 2). The light ray makes an angle θ A with axis x 3 (the normal to the refractive surface) before refraction and an angle θ B with axis x 3 after refraction.

4. Window blind - Wikipedia

   en.wikipedia.org/wiki/Window_blind

   Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.

5. Visible spectrum - Wikipedia

   en.wikipedia.org/wiki/Visible_spectrum

   The visible range of most animals evolved to match the optical window, which is the range of light that can pass through the atmosphere. The ozone layer absorbs almost all UV light (below 315 nm). [19] However, this only affects cosmic light (e.g. sunlight), not terrestrial light (e.g. Bioluminescence).

6. Fresnel equations - Wikipedia

   en.wikipedia.org/wiki/Fresnel_equations

   In optics, one usually knows the refractive index n of the medium, which is the ratio of the speed of light in vacuum (c) to the speed of light in the medium. In the analysis of partial reflection and transmission, one is also interested in the electromagnetic wave impedance Z , which is the ratio of the amplitude of E to the amplitude of H .

7. Snell's law - Wikipedia

   en.wikipedia.org/wiki/Snell's_law

   Refraction of light at the interface between two media of different refractive indices, with n 2 > n 1.Since the velocity is lower in the second medium (v 2 < v 1), the angle of refraction θ 2 is less than the angle of incidence θ 1; that is, the ray in the higher-index medium is closer to the normal.