Optics Answers

what is the basic principle of raman spectroscopy? how we can interpret the raman spectrum data? what information we get from raman spectra? which software is best to analtze raman data?

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R=4

Initially unpolarized light is incident on a series a polarizing sheets. You decide to investigate what percentage of the initial intensity is transmitted for a variety of configurations of the system. Give that percentage for each of the following situations.

a. Two polarizers with the second sheet's polarizing angle at 90 degrees with the first sheet's.
b. You add an additional polarizer in the middle of the configuration in part a, whose angle is halfway between the other two's angle
c. 4 polarizing sheets, each at an angle of 30 degrees with the previous.
d. We could obviously continue adding as many sheets as we like in this fashion. if we now have light polarized in the x direction, and we want to change its polarization by 90 degrees, what's the minimum number of polarizing sheets do we need in order to keep 90% of its intensity?

White light reflected at a perpendicular incidence from a uniform soap film has an interference maximum at 666 nm, and a minimum at 555 nm, with no minima between 666 nm and 555 nm. If n=1.34 for the film, what is the film thickness?

The material to be used for an antireflective coating has index of refreaction of 1.25. How thick should the coating be to give the best result for lambda=550 nm and an angle of incidence of 30 degrees withthe normal

answer true or false is work always associated with transformation of energy

Monochromatic light with wavelength of 750 nm passes through two narrow slits. If the slits are( 25 x10-6 m) apart, at what angle will the fourth order bright fringe appear on a viewing screen?

a. Give two converging lenses of focal lengths 50 cm and 5 cm. Show with the help of ray diagram how they will be arranged to obtain a magnified image of a distant object.
b. What suggestion would you make to obtain a greater magnification?

In the displacement method,a convex lens is placed in between an object and a screen. If the magnification in the two positions are m1 and m2 and the displacement of the lens between the two positions is x,then the focal length of the lens is
(1)x/m1+m2 (2)x/m1-m2 (3) x(m1+m2)² (4)x/(m1-m2)²

A person whose least distance of distinct vision is 20 cm uses a converging lens of focal length 5 cm as a magnifying glass. What is the magnification when the lens is held close to eye and the image is formed at the least distance vision