question_answer

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:            [JEE Main 9-4-2019 Afternoon]

A) 5 : 3

B) 2 : 1

C) 4 : 3

D) 3 : 1

Correct Answer: D

Solution :

[d] Magnification is 2

If image is real,

If image is virtual,