If a convex lens of power, +4D and a concave lens of power. -10D are placed in
contact with each other calculate their resultant of focal length
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- A convex lens of power +4D and a concave lens of power -10D are placed in contact to each other.
- The resultant focal length .
The power of the two lens are +4 Dioptre and -10 Dioptre . We can find its resultant power by adding them as ,
We know that power of a lens is reciprocal of its focal length . Therefore ,
Answered by
1
Answer:
A
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
Explanation:
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