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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.
Relationship between color and light.
Explanation of since an image is formed using convex lenses.
Explanation of since an image is formed using convex lenses.
Image formation in mirrors
How a telescope works combining lenses of correct form
Formation of nitid specular images
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