Reader inquiries frequently concern the optimal binocular type for astronomical observation. Two primary binocular prism designs are distinguished: Porro prism and roof prism. Porro prism binoculars ...
The net of a 3D shape is what a shape looks like when opened into a 2D shape. The net can help to show the areas of each face that make up the surface area of a shape. The same units are needed for ...
THE revised edition of Prof. SouthalPs text-book of geometrical optics, in addition to a number of new problems scattered throughout the book, contains an important new chapter at the end of the ...
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