A) 25
B) 50
C) infinite
D) zero
Correct Answer: D
Solution :
Focal length of combination of lenses placed in contact is |
For convex lens, |
For concave lens, |
Hence, |
Hence, power of combination, |
Note: As a convex and a concave lens of same focal lens are placed in contact, so we get achromatism i.e., combination if free from chromatic aberration. |
You need to login to perform this action.
You will be redirected in
3 sec