Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • In a terrestrial telescope, the focal length of the objective is 90cm, and of eye lens is 6cm. If the final image is at 30cm, then the magnification will be <div class='qna-optio

In a terrestrial telescope, the focal length of the objective is 90cm, and of eye lens is 6cm. If the final image is at 30cm, then the magnification will be 

Option: 1

9


Option: 2

18


Option: 3

30


Option: 4

36


Answers (1)

best_answer

 

 

m=\frac{f_{o}}{f_{e}}\left(1+\frac{f_{e}}{D}\right) \Rightarrow m=\frac{90}{6}\left(1+\frac{6}{30}\right) \Rightarrow m=18

Posted by

Devendra Khairwa

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

Andhra launches free JEE, NEET coaching to over 1 lakh govt school students
anam-khan

JoSAA Counselling 2025 LIVE: BTech registration starts at josaa.nic.in for IIT, NIT, IIIT admissions
anam-khan

Kota: 17-year old student from UP preparing for JEE dies of electrocution in hostel

Latest Question