Two coaxial lenses of power + 4D and - 2...

Two coaxial lenses of power `+ 4D` and `- 2D` are placed in contact. The focal length of combination is

A

0.5 m

B

0.25 m

C

0.16 m

D

`-0.5 m`.

Verified by Experts

Similar Questions

Explore conceptually related problems

Two lenses of power +2D and -5D are kept in contact. The focal length of the combination is

Two lenses of powers + 1.5 D and - 1 D are kept in contact. The focal length of the combination is

Two lenses of power +3.5 D and - 2.5 D are placed in contact. The lens in the combination set up acts like a

Two convex lenses separated by a distance are brought in contact. The focal length of the combination

Convex lens of power 4D and a concave lens of power 3D are placed in contact. The equivalent power of the combination is

Two thin convex lenses of focal length f_1 and f_2 are kept in contact. The power of the combination is

Two lenses of local lengths 0.20m and 0.30m are kept in contact. Find the focal length of the combination. Calculate power of two and combination.