For a telescope, the focal lengths of two lenses are 30 cm and 10 cm. One acts as objective and the other as eye-piece. The length of the telescope is
40 cm
3 cm
200 cm
30 cm
A
40 cm
B
3 cm
C
30 cm
D
200 cm
Open in App
Solution
Verified by Toppr
focal length of objective lens
fo=30cm
focal length of eyepiece lens
fe=10cm
Was this answer helpful?
0
Similar Questions
Q1
For a telescope, the focal lengths of two lenses are 30 cm and 10 cm. One acts as objective and the other as eye-piece. The length of the telescope is
View Solution
Q2
A small laboratory telescope has an objective lens of focal, length 140cm and an eye-piece of focal length 6cm. Then, separation between the objective and eye-piece is :
View Solution
Q3
A small telescope has an objective lens of focal length 144 cm and an eye piece of focal length 6.0 cm. What is the separation between the objective and the eye piece then?
View Solution
Q4
A telescope has objective and eye-piece of focal lengths 200 cm and 2 cm respectively. The magnifying power of the telescope for normal vision is
View Solution
Q5
The objective of a terrestrial telescope has focal length of 120 cm and diameter 5 cm. The focal length of the eye piece is 2 cm. The magnifying power of telescope for distant object is :