Light from He-Ne laser (𝜆 = 633 nm) is used to illuminate two narrow slits. The interference pattern is observed on a screen located 3.0 m behind the slits. Eleven bright fringes are seen, spanning 5.2 cm. a. Can a small angle approximation be used? b. What is the separation between the slits?

A laser with a wavelength of 551 nm illuminates two narrow slits. The interference pattern from the double slits is viewed on a screen that is 1.50 m away. Over a distance of 46.0 mm there are 13.0 bright fringes with the first and last fringe situated exactly at each end of that distance. What is the spacing between the two slits?

If light illuminates a double slit an interference pattern of alternating bright and dark spots is seen. The intensity of the bright spots is brighter at the centre due to the width of the slits. The bright interference fringes will be readily observed inside the broad central diffraction maximum. Outside this they will be much fainter.A laser of wavelength λ = 650 nm is shone on a pair of slits each of width a = 27 µm. The slit spacing is d = 0.3 mm. The resulting interference pattern is projected on to a screen a distance L= 2.6 m from the double slit.Counting out from the (n= 0) central bright interference fringe, how many more bright interference fringes will be seen before the intensity drops to zero at the edge of the central diffraction maximum.Express your answer to the nearest whole number.

In part A of the experiment a pair of slits are illuminated with a laser and an interference pattern is observed. The slit spacing is d = 0.0001 m and the pattern is projected on to the wall a distance L= 2.23 m from the slits. From one dark spot 7 further dark spots are counted and the distance is measured to be Z = 0.097 m.Calculate the wavelength λ of the laser.Express answer in nm (1x10-9m) to the nearest whole number.

In a two-slit experiment, monochromatic coherent light of wavelength 600 nm passes through a pair of slits separated by 22 micrometers.  At what angle away from the centerline does the first bright fringe occur?

In part A of the experiment a pair of slits are illuminated with a laser and an interference pattern is observed. The slit spacing is d = (0.100 ± 0.003) mm and the pattern is projected on to the wall a distance L= (2.352 ± 0.02) m from the slits. From a dark spot 8 further dark spots are counted and the distance is measured to be Z = (12.2 ± 0.4) cm.The wavelength of the laser is calculated to be λ = 648 nm.Calculate the uncertainty in the wavelength. Express answer in nm (1x10-9m) to the nearest whole number.