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Class 12 NEET Physics Optics Questions Part 1
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© examsnet.com
Question : 73
Total: 100
If a convex lens of focal length
80
c
m
and a concave lens of focal length
50
c
m
are combined together, what will be their resulting power?
(1996)
+
7.5
D
−
0.75
D
+6.5 D
-6.5 D.
Validate
Solution:
Focal length
(
f
1
)
=
80
c
m
and
(
f
2
)
=
−
50
c
m
(Minus sign due to concave lens)
Power of the combination
(
P
)
=
P
1
+
P
2
=
100
f
1
+
100
f
2
=
100
80
−
100
50
=
−
0.75
D
© examsnet.com
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