If a pair of slits are illuminated by a coherent source of radiation, and the radiation from the slits then illuminates a screen as shown below. At the centre of pattern C on the screen formed by the slits, the intensity of the radiation will be:Select one:a.Lightb.Darkc.Same uniform intensity as there is no interference fringes formed.Clear my choice

A pair of slits are illuminated by a coherent source of red light, and the radiation from the slits then illuminates a screen as shown below. The first maximum formed by constructive interference is seen a distance y from the central maximum C.If the light source is changed to blue light, the position of the first maximum will be:Select one:a.Further from the central maximum.b.Closer to the central maximum.c.The same.d.There will be no fringe pattern unless the slit spacing is also changed.

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 = 31 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.

5. A single slit of width 0.05 mm is illuminated with monochromatic light of wavelength 500nm. Calculate the intensity of light at an angle of 20∘ relative to the central maximum on a distant screen.

f 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 = 17 µm. The slit spacing is d = 0.2 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.

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?