Question

1) The graph below shows the intensity of monochromatic light on a screen far away from a double slit. On the blank set of axes sketch the intensity of light if one of the slits is blocked. Assume the wavelength of the laser is 750 nm. 2) If the screen from problem 1) above is 1.5 meters away from double slit what is the distance between the two slits? 3) If the screen from problem 1) above is 3.0 meters away from double slit what is the width of the two slits?

Answer 1

please upvote ? if you like my answer ?

lambda = 750 nm delta = 1.5 m y = 3.5 mm (distance of 1st from central maxima) Now y_1 = lambda D/d so d = lambda D/y_1 implies distance between slits d = 750 times 10^- 9 times 1.5/3.5 times 10^- 3 = 321.43 times 10^- 6 m d = 0.32 mm \r\n c) for max no of maxima ion theta = pi/2 & m = 3 from intensity pattern so slit width l = 3 lambda l = 2.25 mu m