Course Code
phy406


Question
Calculate the wavelength of radiation emitted by an LED made up of a semiconducting material with band gap energy 2.8eV.

Answer
4430.8 Å



Question
Which of the following is an example of optical pumping?

Answer
Ruby laser



Question
Which of the following is a unique property of laser?

Answer
Coherence



Question
Newton’s rings can be viewed through a ___________

Answer
telescope



Question
The lens used in Newton’s rings experiment in addition to the glass plate, to trap air film is

Answer
plano convex



Question
The penetration of waves into the regions of the geometrical shadow is

Answer
diffraction



Question
Correlation between the field at a point and the field at the same point at later time is known as

Answer
Temporal coherence



Question
The discovery of the laser gave birth to an entirely new branch of optics known as ____ optics

Answer
nonlinear



Question
Most gaseous systems have a high degree of optical perfection simply because the density of the gas is

Answer
uniform



Question
A direct conversion of electrical energy into radiation occurs in light emitting _____ optics

Answer
diodes


 Try Another Search