An astronomical telescope has an eyepiece of focal-length 5 cm. If the angular magnification in normal adjustment is 10, when final image is at least distance of distinct vision (25 cm) from eye piece, then angular magnification will be :
A
10
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
12
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
50
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
60
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is B 12 If m is the magnification of a telescope in normal adjustment, then m′=m(1+feD )