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Class 12 NEET Physics Optics Questions Part 1
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© examsnet.com
Question : 48
Total: 100
A convex lens and a concave lens, each having same focal length of
25
c
m
, are put in contact to form a combination of lenses. The power in diopters of the combination is
(2006)
zero
25
50
infinite.
Validate
Solution:
Focal length of convex lens
f
1
=
25
c
m
Focal length of concave lens
f
2
=
−
25
c
m
Power of combination in dioptres,
P
=
P
1
+
P
2
=
100
f
1
+
100
f
2
=
100
25
−
100
25
=
0
© examsnet.com
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