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Date: October 5, 2019

Topic:

Recall

Compound Lenses

Vignetting(光晕)

Chromatic Aberration 色差

Geometric Distortion

Notes

![](<https://s3-us-west-2.amazonaws.com/secure.notion-static.com/95e71658-d8ad-4d6b-8d5d-9cf0f2a81ede/Screen_Shot_2021-04-08_at_5.57.04_PM.png>)

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Refractive index (and hence focal length) of lens is different for different wavelengths.

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