Question

Which of the following is not an optical telescope?

• A. Refracting telescope
• B. GMRT
• C. Newtonian telescope
• D. Cassegrain Telescope

Answer 1

The correct option is B GMRT

In optical telescope, the optical instruments like plane mirror or concave lens or convex lens are used.
Refracting, Newtonian and Cassegrain telescopes are the type of optical telescopes.
GMRT is a radio telescope, it detects radio waves having wavelengths of about a metre coming from heavenly bodies to study those bodies.