Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa

A convex lens of focal length 20\:cm produces images of the same magnification 2 when an object is kept at two distances x_{1}\:\:and\:\:x_{2}(x_{1}>x_{2}) from the lens . The ratio of x_{1}\:\:and\:\:x_{2} is :

  • Option 1)

    2:1

  • Option 2)

    3:1

  • Option 3)

    5:3

  • Option 4)

    4:3

 

Answers (1)

best_answer

By using lens formula

\frac{1}{2X_1}-\frac{1}{-X_1}=\frac{1}{20}

\Rightarrow X_1=30

\\\frac{1}{-2X_{2}}-\frac{1}{-X_{2}}=\frac{1}{20}\\\\\\\:\Rightarrow X_{2}=10

\Rightarrow X_{1}:X_{2}=30:10=3:1


Option 1)

2:1

Option 2)

3:1

Option 3)

5:3

Option 4)

4:3

Posted by

solutionqc

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

Amrita BTech Admission 2025: JEE Main-based registration deadline extended to August 30

Latest Question