VIVA PHYSICS

Full form of “LASER”

Light Amplification by Stimulated Emission of Radiation

What is a Diffraction Grating?

A diffraction grating is an optical component consisting of a large number of equally spaced parallel slits or lines that diffract light and produce a series of bright and dark fringes or orders of spectra.

What are the requisites of a good grating?

The requisites of a good grating include a large number of closely spaced lines or slits per unit length, high transparency, high diffraction efficiency, and low stray light.

What is a grating element?

A grating element is the distance between two adjacent slits or lines on a diffraction grating. It is usually measured in micrometers or nanometers.

How many orders do you get here? Why?

You get multiple orders of spectra with a diffraction grating because light of different wavelengths is diffracted at different angles, producing a series of bright and dark fringes or orders. The number of orders depends on the wavelength of the incident light and the grating element

What is the main difference between a prism spectrum and a grating spectrum?

The main difference between a prism spectrum and a grating spectrum is that a prism spectrum is produced by the dispersion of light due to refraction, whereas a grating spectrum is produced by the diffraction of light due to interference

What is the effect of increasing the number of lines per cm of the grating using a diffraction grating

The effect of increasing the number of lines per cm of the grating using a diffraction grating is to increase the angular dispersion of the diffracted light and the resolving power of the grating

What type of grating is used in this experiment?

A plane transmission grating is used in this experiment, which consists of a flat glass or plastic substrate with closely spaced parallel lines ruled or etched on its surface

What will happen if the slit is illuminated with white light?

Suppose the slit is illuminated with white light. In that case, the diffraction grating will produce a series of spectra, each with a different color(rainbows), because the white light is made up of a range of wavelengths that are diffracted at various angles.