Question

monochromatic light of wavelength 500 nm is used in young's double slit experiment.one of the slit is covered by a glass sheet of thickness 2.0×10mm and refractive index 1.5 .the number of fringes shifted by the introduction of the sheet is?
options
1- 14
2-16
3-18
4-20​

Answer 1

Answer:

the answer is fourth one