90) A viewing screen is separated from a double-slit source by 1.2 m. The distance between the two slits is 0.030 mm. The second-order bright fringe m =2 is 4.5 cm from the center line. Distance between adjacent bright fringes is

91) A light source emits visible light of two wavelengths:???= 430 nm and??' = 510 nm. The source is used in a double-slit interference experiment in which L = 1.5 m and d = 0.025 mm. separation distance between the third order bright fringes. is

92) In a two-slit interference experiment in which the slits are 0.200 mm apart and the screen is 1.00 m from the slits. The m = 3 bright fringe is 9.49 mm from the central fringe. Wavelength of the light is

93) Two slits are made one millimetre apart and the screen is placed one metre away. Blue green light of wavelength 500 nm. is used . what should the width of each slit be to obtain 10 maxima of the double slit pattern within the central maximum of the single slit pattern

94) Assume that light of wavelength 6000?A⁰?is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of 100 inch?