Question

write an activity to show that focal lenght of lenses is varies when it is kept in different medium​

Answer 1

Answer:

i) Take a beaker whose height is much greater than the focal length of the lens and fill it with water. ii) Keep a black stone at the bottom of the vessel. iii) Now dip the lens into water using circular lens holder such that it is at a distance which is less than or equal to focal length of the lens in air.

Answer 2

Explanation:

i) Take a beaker whose height is much greater than the focal length of the lens and fill it with water. ii) Keep a black stone at the bottom of the vessel. iii) Now dip the lens into water using circular lens holder such that it is at a distance which is less than or equal to focal length of the lens in air