Laser Projection In a laser projection system, the optical angle or scanning angle 0 is related to the throw distance D from the scanner to the screen and the projected image width W by the equation w D csc 0-cot 0° a. Show that the projected image width is given by W = 2D tan

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Ratios

A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.

Trigonometric Ratios

Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.