MEDIUM
JEE Main
IMPORTANT
Earn 100
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 :
If she observes that , the wavelength of light used is :
100% studentsanswered this correctly
Important Questions on Wave Optics
EASY
JEE Main
IMPORTANT
Two beams, A and B of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam A has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30o makes the two beams appear equally bright. If the initial intensities of the two beams are IA and IB respectively, then equals :
MEDIUM
JEE Main
IMPORTANT
A beam of unpolarised light of intensity is passed through a polaroid and then through another polaroid which is oriented so that its principle plane makes an angle of relative to that of . The intensity of the emergent light is:
EASY
JEE Main
IMPORTANT
Two coherent point sources and are separated by a small distance as shown in the figure. The fringes obtained on the screen will be
MEDIUM
JEE Main
IMPORTANT
The angular width of the central maximum in a single slit diffraction pattern is . The width of the slit is . The slit is illuminated by monochromatic plane waves. If another slit of the same width is made near it, Young's fringes can be observed on a screen placed at a distance from the slits. If the observed fringe width is , what is slit separation distance? (i.e., the distance between the centres of each slit.)
HARD
JEE Main
IMPORTANT
In Young's double-slit experiment, the distance between slits and the screen is and monochromatic light of wavelength is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular distance between the slits. If the angular resolution of the eye is , then the value of is close to
MEDIUM
JEE Main
IMPORTANT
Sodium light of wavelengths and is used to study diffraction at a single slit of aperture . The distance between the slit and the screen is . The separation between the positions of the first maxima of diffraction pattern obtained in the two cases is _____
MEDIUM
JEE Main
IMPORTANT
The two light beams having intensities and interfere to produce a fringe pattern on a screen. The phase difference between the beams is at point and at point . Then the difference between the resultant intensities at and will be :
MEDIUM
JEE Main
IMPORTANT
For a specific wavelength of light coming from a galaxy moving with velocity , the observed wavelength is . The value of is
