Prerequisite: geometry, physics
The only new material in this chapter is combined lenses in which light travels through more than one lens. It is surprisingly easy, which makes me wonder why it was not included in regular physics.
The key is this: the image through the first lens becomes the object for the second lens. This holds true even if the first image happens to cross the second lens.
And if you remember using microscopes in biology class, the total magnification is the product of the lenses' individual magnifications.
That is all~
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