Q. In a YDSE setup interference fringes are obtained by sodium light of wavelength . On screen the fringes have an angular width . Now the wavelength of light is changed and it is found that fringe width increases by , the new wavelength of incident light is:

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A

B

C

D

Solution:

The angular width of interference fringes in YDSE setup for the two wavelengths are given as
and

Questions from Wave Optics

1. Which of the following phenomena support the wave theory of light ?
(a) scattering
(b) interference
(c) diffraction
(d) velocity of light in a denser medium is less than the velocity of light in the rarer medium

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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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