The power of two lenses are + 6 D and - 4 D , determine the power of the combination of two lenses.

What is the power of a combination of lenses?

Two lenses have powers + 1 D and - 2 D respectively ,The power of combination si:

Obtain the equation of power for combination of lenses.

(i) A convex lens of power +6D and a concave lens of power -4D are combined together. Find the power of the combination of two lenses.

Give the formula for calculating the power of combination of two lenses.

Two lenses having powers + 6 D and - 4D are placed in contact.The power of the combintin is

If D_1 and D_2 are the powers of the component lenses and D is the power of the lens combination then

The power of a concave lens is 10 D and that of a convex lens is 6 D. When these two lenses are placed in contact with each other, the power of their combination will be:

The dispersive powers of the materials of the two lenses are in the ratio 4:3 .If the combination of these two lenses is of focal length 60 cm,then the focal lengths of the component lenses are: