| 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. |
Answer:
(i) Amar is having scientific aptitude and he is hard working. (ii) Ray diagram of an astronomical telescope focused for least distance of distinct vision. 
\[{{M}_{D}}=\frac{-\,{{\text{f}}_{o}}}{{{\text{f}}_{e}}}\left( 1+\frac{{{\text{f}}_{e}}}{D} \right)\] And \[{{M}_{\infty }}=\frac{-\,{{\text{f}}_{o}}}{{{\text{f}}_{e}}}\]
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