10-06-2014, 12:25 PM
Physics Lab Viva Voce Questions and its answers
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Laser Parameters
1. What is semi conductor diode laser?
Semiconductor diode laser is a specially fabricated pn junction diode. It emits laser light when it is
forward biased.
2. What is LASER?
The term LASER stands for Light Amplification by Stimulated Emission of Radiation. It is a device
which produces a powerful, monochromatic collimated beam of light in which the waves are coherent.
3. What are the characteristic of laser radiation?
Laser radiations have high intensity, high coherence, high monochoromation and high directionality
with less divergence.
4. Define numerical aperture.
Numerical aperture is defined as the light gathering capability of an optical fiber. It is the sine of the
acceptance angle.
NA=sineøa
5. What is the principle used in fiber optic communication system?
The principle behind the transmission of light waves in an optical fiber is total internal reflection.
AIR WEDGE
1.What is meant by interference of light?
When the two waves superimpose over each other, resultant intensity is modified. The modification in
the distribution of intensity in the region of superposition is called interference.
2.Is there is any energy loss in interference phenomenon?
No, there is only redistribution of energy ie, energy from dark places is shifted to bright places
3.What are interference fringes?
They are alternately bright and dark patches of light obtained in the region of superposition of two wave
trains of light.
4.What is the shape of fringes in wedge shaped film?
The fringes in wedge-shaped film are straight line fringes.
5.What type of source is required in division of amplitude?
In division of amplitude a broad source is required so that the whole firm may be viewed together.