What changes in the focal length of a convex lens occur,when the incident violet light on them is replaced by red light?

What changes in the focal length of a concave mirror when the incident violet light on them is replaced by red light?

How does the power of a convex lens vary,if the incident violet light is replaced by red light?

How does the power of a convex lens vary if the incident red light is replaced by violet light?

What happens to be focal length of convex lens when it is immersed in water?

The change in focal length of an eye lens is caused by the action of the:

Violet light is incident on a converging lens of focal length f. State with reasons how focal length of the lens will change, if the violet light is replaced by red light.

How does the focal length of a glass lens change when blue light is replaced by red light. Give reasons.

What is the focal length of a convex lens (mu=1*5) with radii of curvature R?