Question
Physics Question on Ray optics and optical instruments
A small telescope has an objective lens of focal length 144cm and an eye piece of focal length 6.0cm. What is the separation between the objective and the eye piece?
A
0.75m
B
1.38m
C
1.0m
D
1.5m
Answer
1.5m
Explanation
Solution
The separation between the objective and the eye piece = Length of the telescope tube f=fo+fe Here, f0=144cm=1.44m, fe=6.0cm=0.06m ∴=1.44+0.06=1.5m