ABHYAAS ACADEMY 

Interference and Diffraction

1.Write the necessary conditions to obtain sustained interference.

2. What kind of fringes do you expect to observe if white light is used instead of monochromatic light.

3. Monochromatic light of wavelength 600nm is incident from air on a water surface. If the refractive index of water is 4/3, then find the wavelength of the refracted light. 

4. Drive the expression for the width of bright fringe in young's exp.

5. Write down the difference between interference and diffraction pattern.

6. Show that the angular width of the first diffraction fringe is half of the Central fringe.

7. What is the effect on the fringe width If the distance between the slits is reduced keeping other parameter same?

8. "Two independent monochromatic sources of light cannot produce a sustained interference pattern" Give Deason.

9. Find the intensity at a point on a screen in young's double slit exp where the interfering waves of equal intensity have a path diff. of (a) wavelength/4  and 
(b) Wavelength / 3

10. Drive the expression for the width of dark fringe in young's exp.

11. Draw the graphical representation of Interference and Diff. fringe pattern.

12. Write down the conditions of Interference due to thin film.