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  4. Light of wavelength 5000 mathringA is incident normally on a slit. First minimum of diffraction pattern is formed at a distance of 5 mm from the central maximum. If slit width is 0.2 mm, then distance between slit and screen will be :

Q. Light of wavelength is incident normally on a slit. First minimum of diffraction pattern is formed at a distance of from the central maximum. If slit width is , then distance between slit and screen will be :

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Solution:

Diffraction minima on either side of central maxima is given as


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1. Which of the following phenomena support the wave theory of light ?
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2. In Young's double slit experiment, how many maxima can be obtained on a screen (including central maxima), if (where is the wavelength of light)?

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3. Light of wavelength is incident normally on a slit of width . The angular width of central maxima in the diffraction pattern is (measured from minimum to minimum)

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4. Using monochromatic light of wavelength , an experimentalist sets up the Young's double slit experiment in three ways as shown.
If she observes that y = the wavelength of light used is :

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5. At two points P and Q on a screen in Young's double slit experiment, waves from slits and have a path difference of 0 and respectively. The ratio of intensities at P and Q will be :

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