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parabolic mirrors

The ancient Greeks knew that the parabolic mirrors are paraboloids of revolution which have the property of concentrating the rays at the focus of the paraboloid.

Spherical lens II

Explanation of since an image is formed using convex lenses.

Spherical lens I

Explanation of since an image is formed using convex lenses.

telescope (optics)

How a telescope works combining lenses of correct form

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