Home
Class 12
PHYSICS
The focal length of the lensese of an as...

The focal length of the lensese of an astronomical telescope are 50 cm and 5 cm. The length of the telescope when the image is formed at the least distance of distinct vision is

A

45cm

B

55cm

C

`(275)/(6)` cm

D

`(325)/(6)` cm

Text Solution

Verified by Experts

The correct Answer is:
D
L = `f_(o) + u_(e) = f_(o) + (f_(e) D)/(f_(e) + D)`
`= 50 + (5 xx 25)/(5 + 25) = (325)/(6) ` cm .
Promotional Banner

Similar Questions

Explore conceptually related problems

The focal lengths of the lenses of an astronomical telescope are 50cm and 5cm . The length of the telescope when the image is formed at the least distance of distinct vision is

The focal length of the objective of an astronomical telescope is 75 cm and that of the eye-piece is 5 cm. If the final image is formed at the least distance of distinct vision from the eye, calculate the magnify- ing power of the telescope.

The focal length of objective and eyelens of a astonomical telescope are respectively 20 cm and 5 cm. Final image is formed at least distance of distinct vision. The magnifying power will be

The focal length of objective and eye lens of a astronomical telescope are respectively 2m and 5 cm . Final image is formed at (i) least distance of distinct vision (ii) infinity. The magnifying power in both cases will be

The length of an astronomical telescope is 40 cm. The focal lengths of its lenses will be

A telescope has an objective of focal length 100 cm and an eyepiece of focal length 5 cm. What is the magnifying power of the telescope when the final image is formed at the least distance of distinct vision ?

The focal length of the objective and eyepiece of an astronomical telescope for normal adjustments are 50 cm and 5 cm. The length of the telescope should be:

The focal lengths of the objective and the eyepiece of an astronomical telescope are 20 cm and 5 cm respectively. If the final image is formed at a distance of 30 cm from the eye piece, find the separation between the lenses for distinct vision:

The focal length of objecive and eye-piece of astronomical telescope are 2 m and 5 cm respectively. The magnifying power of telescop when final image is formed at infinity is