The sodium lamp used in a physics laboratory gives out light uniformly. Suppose that the lamp uses 40 W. Calculate the magnitude of electric field.
To calculate the magnitude of the electric field from the sodium lamp, we need to relate the power of the lamp to the intensity of the emitted light and then to the electric field. A sodium lamp emitting light uniformly can be modeled as radiating power (P = _____ ______ _____ __________ _________ _________ ___ ____ ________ __________.
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Obtain expressions for reflection and transmission amplitude coefficients when electric vector associated with a plane monochromatic electromagnetic wave which is in the plane of incidence.
Discuss the concept of missing orders with reference to double slit diffraction pattern.
द्वि-रेखाछिद्र विवर्तन पैटर्न में लुप्त क्रमों की व्याख्या करें।
A plano-convex lens of radius 1.0 m is placed on an optically flat glass plate and is illuminated by an extended monochromatic source. Assume that the point of contact is perfect. The diameters of the and
dark rings in the reflected light are
and
. Next, the space between the lens and the glass plate is filled with a liquid. The diameter of the
ring changes to
. Calculate the refractive index of the liquid when the ring is (i) dark, and (ii) bright, if the wavelength of light is
.
Obtain an expression for elliptically polarised light resulting due to superposition of two orthogonal linearly polarised light waves. Show that plane polarised light and circularly polarised light are special cases of elliptically polarised light.
Two energy levels of an atomic system are separated by energy corresponding to frequency 3.0 × 10¹⁴ 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 400 K. Take k_B = 1.38 × 10⁻²³ JK⁻¹ and h = 6.6 × 10⁻³⁴ Js.
The refractive indices of the core and cladding materials of an optical fibre are 1.51 and 1.39, respectively. Calculate the numerical aperture and light gathering capacity of the fibre.