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UPSEE Solved Model Paper 1
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© examsnet.com
Question : 11
Total: 150
The minimum distance between an object and its real image formed by a thin convex lens of focal length f is Kf. Find the value of K.
1
4
3
2
Validate
Solution:
since object and image is real
Object distance =
−
x
1
Image distance =
x
2
=
x
0
=
x
1
+
x
2
;
1
x
2
−
1
−
x
1
=
1
f
⇒
x
1
+
x
2
=
x
1
x
2
f
=
x
1
x
2
f
Solving above equation for real values of
x
1
x
2
we get
x
0
= 4f
∴ K = 4
© examsnet.com
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