A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are joined together. The power of the combination will be

A convex lens of focal lenth 30 cm and a concave lens of focal length 60 cm are placed in contact.Find the power of the combination.

A convex lens of focal length 30 cm and a concave lens of focal length 0.6m are placed in contact. Find the power of the combination.

A convex lens of focal length 40 cm a concave lens of focal length 40 and a concave lens of focal length 15 cm are placed in contact. The power of this combination of are placed in contact. The power of this combination in diopters is

If a convex lens of focal length 80 cm and a concave lens of focal length 40 cm are combined together. What will be their resulting power?

A convex lens of focal length 50 cm, a concave lens of focal length 50 cm and a concave lens focal lens 20 cm are placed in contact. The power of this combination in diopters will be

A convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined toghether. What will be their resulting power ?

A convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined toghether. What will be their resulting power ?

If a convex lens of focal length 80 cm and a concave lens of focal length 50 cm re combined together ,what will be their resulting power?