Question
Question: An astronomical telescope of ten- fold angular magnification has a length of 44 cm. The focal length...
An astronomical telescope of ten- fold angular magnification has a length of 44 cm. The focal length of objective is –
A
4 cm
B
40 cm
C
44 cm
D
440 cm
Answer
40 cm
Explanation
Solution
f0 + fe = 44 , 
= 10
\ f0 = 40 cm