Question:
The dispersive power of material of a lens is 0 04 and mean
Last updated: 6/10/2023
![The dispersive power of material of a lens is 0 04 and mean](https://media.kunduz.com/media/sug-question-candidate/20210613171321990066-1877536.jpg?h=512)
The dispersive power of material of a lens is 0 04 and mean focal length of lens is 15 cm The difference in focal lengths of lens for violet and rec colour is 3 mm 04 mm O 5 mm 6 mm