Question

A
convex lens has refractive Index 1.5 has
focal length 20 cm. The change in focal length
of lense in water​

Answer 1

Answer:

18.9 please mark me the brainliest

Answer 2

Explanation:

When the lens is in air

...(i)

When lens is in water,

or ....(ii)

Divide (i) by (ii), we get

or,

or,

The change in focal length =

58.2