To which regions of the EM spectrum do the following wavelengths belong:

a) 250 nm
b) 1500 nm

What is the difference between polarised light and unpolarized light?

Name the principle on the basis of which optical fibres work?

Calculate dispersive power of a transparent material given by:

n_v = 1.56, n_r = 1.54, n_y= 1.55

What is meant by short-sightedness?

Two metals A and B have work functions 4 eV and 6 eV respectively. Which metal has lower threshold wavelength for photoelectric effect.

Calculate angular momentum of an electron in the third Bohr orbit of hydrogen atom.

In a nuclear reactor, what is the function of a moderator?

In our nature, where is the nuclear fusion reaction taking place continuously?

20.

What is the use of a Zener diode?