Question

17. In a double slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 100 cm. What is the phase difference (in degrees) between the waves from the two slits arriving at a point 5 mm from the central maximum when the wavelength is 400 nm? (Convert your result so the angle is between 0 and 3600.) ANS-180°

Answer 1

Given is:-

Distance between the slits    

Distance between the screen and slits is  

Distance of point from central maxima  

Now,

thus

since tan theta is so small so we can take   

thus

now,

by plugging all the values we get