किसी प्रकाशिक तंतु के क्रोड तथा अधिपट्टन पदार्थों के अपवर्तनांक क्रमशः 1.51 तथा 1.39 हैं। तंतु की संख्यात्मक द्वारक तथा प्रकाश संग्रहण क्षमता परिकलित करें।
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दो समतल ध्रुवित लंबवत् प्रकाश तरंगों के अध्यारोपण के फलस्वरूप उत्पन्न दीर्घवृत्तीय ध्रुवित प्रकाश के लिए व्यंजक प्राप्त करें। सिद्ध करें कि समतल ध्रुवित प्रकाश तथा वृत्तीय ध्रुवित प्रकाश, दीर्घवृत्तीय ध्रुवित प्रकाश की विशेष स्थितियां हैं।
Obtain expressions for reflection and transmission amplitude coefficients when electric vector associated with a plane monochromatic electromagnetic wave is in the plane of incidence.
Discuss the concept of missing orders with reference to double slit diffraction pattern.
Two energy levels of an atomic system are separated by energy corresponding to frequency . 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
. Take
and
.
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.
Discuss Rayleigh’s criterion for resolving power of an optical instrument. Obtain an expression for resolving power of a microscope.
A plano-convex lens of radius 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
.