Two plane polarised light waves are propagating along the positive z-direction such that their electric field vectors are mutually perpendicular. These waves are superposed. Obtain the condition under which the resultant wave will be circularly polarised
When two plane-polarized light waves with mutually perpendicular electric field vectors propagate along the positive z-direction, their superposition can result in circularly polarized light under specific conditions. Circular polarization occurs when the amplitudes of the two perpendicular waves have equal magnitudes and a phase difference of 90 degrees.
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Interference fringes are produced by a beam of monochromatic light incident normally on a wedge shaped film of refractive index 1.5. The angle of the wedge is 15 seconds of an arc and the two successive dark fringes are 0.4 cm apart. Calculate the wavelength of light.
A beam of parallel light of wavelength 6000 Å is incident normally on a 1 rupee coin of diameter 3 cm. If an observation screen is placed at a distance of 1 m from the coin, how many Fresnel zones would be obstructed by it (the coin)? For what separation between the coin and the screen, only 5 zones would be cut off
Two energy levels of an atomic system are separated by energy corresponding to frequency 5.0 Hz. Assume that all atoms are in one or the other of these two energy levels. Compute the fraction of atoms in the upper energy level at temperature 600 K. Take kg = 1.38
JK
and h = 6.6
Js.
Derive an expression for the intensity of the diffraction pattern obtained due to Fraunhofer diffraction from a single slit.
6 principal maxima are observed in the diffraction pattern due to a diffraction grating. Calculate the number of lines per cm in the grating if the wavelength of the light is 5000 Å
Why pumping is necessary for laser action? Compare and contrast three level and four level pumping schemes for lasers.
A wedge shaped film is obtained by placing a thin wire between two plane glass plates at one end keeping them in contact with each other at the other end. When the film is illuminated by light of wavelength 6000 Å, 40 fringes are observed. Calculate the radius of the wire