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Is it true that concave lenses are used to make the astronomical telescope?

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a

True

b

False

answer is B.

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Detailed Solution

The above statement is False.
A convex lens converges a beam of light parallel to its main axis. Also, the astronomical telescope is used to see at a far distance, i.e., space. So, the telescope must gather the light from a far distance to form the image. Since a convex lens is converging, it converges all the light from space and forms a real image. In addition, the telescope uses two convex lenses to achieve the purpose. On the other hand, concave lenses are diverging, which diverges all the light falling on their surface.
The correct statement would be that convex lens are used to make the astronomical telescope

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Is it true that concave lenses are used to make the astronomical telescope?