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Boundless Physics
Geometric Optics
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Section 3

Lenses

Book Version 3
By Boundless
Boundless Physics
Physics
by Boundless
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5 concepts
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Thin Lenses and Ray Tracing

Ray tracing is the technique of determining the paths light rays take; often thin lenses (the light ray bending only once) are assumed.

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The Thin Lens Equation and Magnification

The thin lens equation relates the object distance do, image distance di, and focal length f.

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Combinations of Lenses

A compound lens is an array of simple lenses with a common axis.

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The Lensmaker's Equation

The lensmaker's formula is used to relate the radii of curvature, the thickness, the refractive index, and the focal length of a thick lens.

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Refraction Through Lenses

Because the index of refraction of a lens is greater than air, a ray moves towards the perpendicular as it enters and away as it leaves.

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