Question

A concave lens of power -3D is placed in contact with a convex lens of power +3D.
The power of the combination is​

Answer 1

Answer:

The power of the combination is​ 0.

Explanation:

Concave lens : In concave lens the middle part of the lens is thinner and the edge part is thicker. It is a diverging lens. The concave lens is used in spy holes in door , telescope etc.

Convex lens : It is totally oposite of the concave lens. In convex lens the middle part of the lens is thicker and the edge part is thinner. It is converging lens. The convex lens is used in projectors , magnifying glass etc.

Power of the lens is the reciprocal of its focal length.

Here a concave lens of power -3D is placed in contact with a convex lens of power +3D.

The power of the combination is​ -3D+3D = 0.

So , the power of the combination is​ 0.

#SPJ3