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

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

In a YDSE experiment red light is replaces by violet light . Then

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

How does focal length of a lens change when red light is replaced by violet light?

How does the angle of minimum deviation of a glass prism vary, if the incident violet light is replaced by red light? Give reason.

How does the angle of minimum deviation of a glass prism vary, if the incident violet light is replaced by red light? Given reason.