21.22.23.24.25.A thin layer of kerosene (n = 1.39) is formed on a wet road (n = 1.33). If the filmthickness is 180 nm, what is/are the possible visible light seen on the layer?A.B.C.400 nm blue light passes through a diffraction grating. The first order bright fringe islocated at 10 mm from the central bright. Which of the following is/are true about thesituation?A.B.C.460 nm700 nm1400 nmIn Young's double slits experiment,A.the slits refract light.B.the wavelength of the light source increases and decreases alternatively.C.the width of the central bright is inversely proportional to the distance betweenslits.A.B.C.The width of the bright fringe is 10 cm.The distance between consecutive bright fringe is 10 cm.The distance between the light source and the screen is 10 cm.A beam of monochromatic light is diffracted by a slit of width 0.45 mm. The diffractionpattern forms on a wall 1.5 m beyond the slit. The width of the central maximum is 2.0mm. Which of the following is/are TRUE about the experiment?A.B.C.The wavelength of the light is 600 nm.The width of each bright fringe is 2.0 mmThe distance between dark fringes is 1.0 mmDevi conducted a light diffraction experiment using a red light. She got thediffraction pattern as shown in FIGURE 7. The distance between indicated darkfringes was measured as 2.5 mm.Central Maximum2.5 mmFIGURE 7Which of the following statement is/are TRUE about the experiment?She used diffraction grating to get the pattern.The width of the central maximum was 2.5 mm.The distance between consecutive bright fringes was 2.5 mm.

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Answered: 21. A thin layer of kerosene (n = 1.39)…

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21. A thin layer of kerosene (n = 1.39) is formed on a wet road (n = 1.33). If the film thickness is 180 nm, what is/are the possible visible light seen on the layer? A. B. C. 460 nm 700 nm 1400 nm