A convex lens of focal length 0.5 m and concave lens of focal length 1 m are combined. The power of the resulting lens 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 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 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?

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 50cm are placed in contact. The resulting will be—