Explain whether the Young's experiment is an experiment for studying interference or diffraction effects of light An ail film spreading over a wet footpath shows colors. Explain how does it happen? Could you obtain Newton's rings with transmitted light? If yes, would the pattern be different from that obtained with
reflected light?
In white light spectrum obtained with a diffraction grating, the third order image of a wavelength coincides with the fourth order image of a second wavelength. Calculate the ratio of the two wavelengths How would you manage to get more orders of spectra using a diffraction grating? Why the Polarold sunglasses are better than ordinary sunglasses?
How would you distinguish between unpolarized and plane polarized lights? Give characteristics of plane and spherical wave fronts?
Give examples of interference of Light?
No. 3 Write answers of any EIGHT questions. Mention one important use of Michelson's interferometer,
(8x2=16)
What happens when white light is made incident on the thin film of irregular thickness at different angles? What are different methods to get polarized light?
Why it is impossible to have diffraction of X-rays from laboratory grating? What are the conditions for the constructive and destructive interference?
Under what conditions can interference of light take place?
What are the types of wave front, give their definitions?
How fringe spacing can be changed?
. Distinguish clearly between refraction and diffraction of light? What type of wave front you expect from a point source of light situated very far distance from point under consideration?
What do you mean by grating element of a diffraction grating?
3 What is final evidence of polarization of light? Q.No. 4 Write answers of any SIX questions.
Describe the Polaroid as an analyzer and as polarizer?
How crystal lattices behave like a natural diffraction grating?
Fsd-15 (6x2=12)
How would you manage to get more order of spectra using a grating?
V Why the center of Newton's rings is dark?
0 What is thin film? Give some of its examples 23 State the Huygens's principle?
Name some phenomenon in which light behaves like particles? viil) What is dicharic substance and what is their use?
What is the distance between two adjacent dark fringes? SECTION II
Bwp-19, Lhr-17,18, Fsd-17, Sgd-17, Mul-15, Rw-16
Attempt any 3 (three) questions. Q.No.5
(5)
Calculate the fringe spacing between two bright fringes using the young double slit experiment? A monochromatic light of A=588 nm is allowed to fall on the half silvered glass plate G, in the Michelson interferometer, if
(3)
Lhr-15,16,17, Fsd-15, Dgk-14, Guj-16, 5gd-18
(a) (b)
mirror M, is moved through 0.233 mm, how many fringes will be observed to shift? Write the construction and working of Michelson's interferometer? And how it is use to find unknown wavelength? (5) (b) Yellow sodium light of wavelength 589 nm, emitted by a single source passes through two narrow slits 1.00 mm apart
Q.No.6 (a)
The interference pattern is observed on a screen 225 cm away. How far apart are two adjacent bright fringes? (3)
Q.No.7
(a) What is meant by polarization and how the white light can be polarized? Describe different method to do it? 151 (b) Blue light of wavelength 480 nm illuminates a diffraction grating The second order image is formed at an angle of 30" from the central image. How many lines in a centimeter of the grating have been ruled? Q.No.8
(3) Dgk-17
a) What is diffraction of light? Describe a diffraction grating and obtain the grating equation to find the wavelength of light used
bl Yellow sodium light of wavelength 589 nm, emitted by a single source passes through two narrow slits 1.00 mm
The interference pattern is observed on a screen 225 cm away. How far apart are two adjacent bright fringes?
Q.No.9
apart
Shwl-14,18, Sgd-18,19, bwl-14, 1hr-15, Mrp-16,8wl-17.5gd-17,15 Describe the diffraction of x-rays by crystals and obtain Bragg's equation or law. The distance between the slits in Young's double slit experiment is 0.25 cm. Interference fringes are formed on a screen placed at a distance of 100 cm from the slits. The distance of the third dark fringe from the central bright fringe is 0.059 cm Find the wavelength of the incident light
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