Fringes are formed when the optical difference (OPD) between a reference wave front and a test wave front based on the interference of light is an integral multiple of the illuminating wavelength.

测试中，当测试波前相对于参考波前的光程差是照明波长的整数倍时形成干涉条纹，由此而形成的二维图就是干涉图像。

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The reflected light intensity distribution of the laser beam illuminating the surface of a specimen will broaden as the surface roughness increases.

照射在样品表面的激光束随着表面粗糙度的不同，反射光密度分布将不同；表面粗糙度增大时，反射光密度将被扩展。

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The invention relates to a projection-type head lamp capable of reinforcing light in a dark space, which comprises a lamp holder, an illuminating part, a shading plate and a light guide plate.

一种可补强暗区光线的投射式头灯，包含：一灯座、一发光件、一遮光板， 以及一导光板。

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The new microscope, called Multi-View SPIM (MuVi-SPIM) shines a thin sheet of light on the embryo, illuminating one layer of the embryo at a time to prevent light damage.

MSN: Fruit fly embryo grows into larva in 3-D video

The most dramatic part of the cave is the opening that allows sunlight in, illuminating a wide section in a shaft of bright light.

FORBES: By Sonya Angraini (Forbes Indonesia)

Mercury arc lamps (the kind used in football stadiums) are not much better, since they emit a lot of ultraviolet light, which contributes to astronomers' woes without illuminating the action in a way that the human eye can detect.

ECONOMIST: Going, going, nearly gone