The resistance of ammeter must essentially be very small. Why?
A parallel beam of unpolarized light in air is at an angle of 55° on a plane glass surface. If the reflected beam is completely plane-polarized, find the refractive index of the glass and the angle of the transmitted beam.
What are the advantages of Michelson's Method for finding the speed of the light?
State Huygen's principle. Does it apply to sound wave in air?
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