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If the source of light used in a Young's double slit experiment is changed from red to violet,
(a)the fringes will become brighter
(b)consecutive fringes will come closer
(c)the intensity of minima will increase
(d)the central bright fringe will become a dark fringe

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Important Questions on Wave Optics
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Using monochromatic light of wavelength , an experimentalist sets up the Young's double slit experiment in three ways as shown.
If she observes that , the wavelength of light used is :

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A parallel beam of light is incident on a tank filled with water up to a height of as shown in the figure below. Ultrasonic waves of frequency are sent along the length of the water column using a transducer placed at the top, and they form longitudinal standing waves in the water. Which of the schematic plots below best describes the intensity distribution of the light as seen on the screen? Take the speed of sound in water to be .

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