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Grade 12Wave Optics

an object is placed at a distance of 1.5m from a screen and a convex lens is interposed between them and magnification produced in 4.what is the focal length?

Profile image of ashwen venkatesh
12 Years agoGrade 12
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1 Answer

Profile image of Arun Kumar
12 Years ago
Hello Student,
1/f=1/v-1/u
|v|/|u|=4
|v|+|u|=1.5
|v|=4(1.5-|v|)
you can |v| from here
Now
v will be -|v|
and u=|u|
Now just replace the value to find the numerical value from the formulae.
Thanks & Regards
Arun Kumar
Btech, IIT Delhi
Askiitians Faculty

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