Question

1. Convex lens of glass is fully immersed in water. It's focal length will increase or decrease as compared to water . Give reasons
2. A convex lens is fully immersed in water.power of lenses decrease .why

Answer 1

1 . when the convex lens is immersed in water then the focal length incereses
2.when the convex lens is immersed in water the focal length incereses
as focal length is inversely proportional to power of lens it decreases