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 40 cm are combined together. 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?

If the convex lens of focal length 10 cm and a concave lens of focal length 50 cm are kept in contact with each other. What will be the power of combination ?

If the convex lens of focal length 10 cm and a concave lens of focal length 50 cm are kept in contact with each other. What will be the behaviour of the combination (behaviour as a convex lens/concave lens) ?

A convex lens of focal length 80 cm and a concave lens of focal length 50cm are placed in contact. The resulting will be—

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

If the convex lens of focal length 10 cm and a concave lens of focal length 50 cm are kept in contact with each other. What will be the focal length of the combination ?

If a convex lens of focal length 20 cm and a concave lens of focal length 30 cm are kept in contract with each other. What will the power of the combination ?