Physical Optics, Numerical Problems
See here solved numerical problems on Physical Optics included in the course of First Year Physics.
S No | Problem |
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Problem 1 | In a Young’s double slit experiment, the separation of the slits is 1 mm and red light of wavelength 620 nm is falling on it. Determine the distance between the central bight band and the fifth bright fringe on the screen which is 3 m away from the slit. See Solution |
Problm 2 | Two parallel slits are illuminated by two wavelengths one of which is 5.8 × 10-7 m. On the screen the fourth dark line of the known wavelength coincides with the fifth bright line of the light of the unknown wavelength. Find the unknown wavelength. See Solution |
Problem 3 | When the movable mirror of the Michelson interferometer is moved 0.1 mm. How many dark fringes pass the reference point if light of wavelength 580 nm is used? See Solution |
Problem 4 | A soap film has a refractive index of 1.40. How thick must the film be, if it appears black when mercury light of wavelength 546.1 nm falls on it normally? See Solution |
Problem 5 | A diffraction grating has 5000 lines per centimeter. At what angle does the second order spectrum of the sodium yellow light of wavelength 589 nm occur? See Solution |
Problem 6 | Light is incident normally on a grating which has 250 lines/mm. Find the wavelength of the spectral line for which the deviation in second order is 12o. See Solution |
Problem 7 | In a certain X-rays diffraction experiment, the first order fringe is observed at an angle of 5o for a crystal plane spacing of 2.8 × 10-10 m. What is the wavelength of X ray used? See Solution |
Problem 8 | An X-ray beam of wavelength 0.48 × 10-10 is used to get Brag reflection from a crystal at an angle of 20o for the first order maxima. What are the possible layer spacing which gives rise to this maxima? See Solution |
Problem 9 | The spacing of one set of crystal planes in NaCl (table salt) is d = 0.282 nm. A monochromatic beam of X-rays produces a Bragg maximum when its glancing angle with these planes is θ = 7°. Assuming that this is a first order maximum (n = 1) find the wave length of the X-rays. See Solution |
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