If a convex lens of power, +4D and a concave lens of power. -10D are placed in
contact with each other calculate their resultant focal length
It's important
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Answer:
Correct answer
0.5 m
Power of the combination of lenses P
c
=P
1
+P
2
∴ P
c
=4−2=2D
Thus focal length of the combination F=
P
c
1
∴ F=
2
1
=+0.5m
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