KVPY 2020-21 SA Exam Previous Papers

Question : 26 of 80

Marks: +1, -0

The following graph depicts the inverse of magnification versus the distance between the object and lens data for a setup. The focal length of the lens used in the setup is

250 m
0.004 m
125 m
0.002 m

Validate

Solution:

By lens formula

{1}/{v}-{1}/{u}={1}/{f}

{u}/{v}-1={u}/{f}

{1}/{m}={u}/{f}+1

{1}/{f}=

slope of the given line

={250-200}/{1-0.8}

=250

f={1}/{250}

=0.004 {m}

Go to Question:

Prev Question

Next Question