• # question_answer Amar got so much interested in astronomy that he decided to make a telescope. He studied about telescopes and its construction. He prepared his own astronomical telescope. He presented his observations in a science seminar and got first prize. (i) What qualities do you find in Amar? (ii) Draw ray diagram of astronomical telescope and give expression for its magnification.

${{M}_{D}}=\frac{-\,{{\text{f}}_{o}}}{{{\text{f}}_{e}}}\left( 1+\frac{{{\text{f}}_{e}}}{D} \right)$             And      ${{M}_{\infty }}=\frac{-\,{{\text{f}}_{o}}}{{{\text{f}}_{e}}}$