Question

what happens when focal length increases​

Answer 1

Answer:

hence, after immersing of lens in water focal length of lens increases. A convex lens made of glass is immersed in water.As a result,its focal length will increase. 2. Its height must be greater than the focal length of lens

Explanation:

Answer 2

Answer:

Explanation:

When a ray of light in incident on the lens parallel to the principal axis, it gets refracted and meets the principal axis at the focus. When the lens is immersed in water the refractive index of the lens reduc... ... The focal length of the lens would be increased when immersed in water