wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The focal lengths of the objective and eye-piece of a telescope are respectively 100 cm and 2 cm. The moon subtends an angle of 0.5 at the eye. If it is looked through the telescope, the angle subtended by the moon’s image will be

A
100
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
50
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
25
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
10
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 25
f0=100 cm
fe=2 cm

Angular magnification of telescope

m=θiθo=fofe where θo is the angle subtended by the object at the eye and θi is the angle subtended by the final image at the eye.

1002=θi0.50
θi=250 where the minus sign indicates the direction in which we measure the angle.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Telescope
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon