Attempt any five:-

1 (a)
Explain why an extensive thin film appears dark in reflected light?

3 M

1 (b)
How will you increase the resolving power of a diffraction grating?

3 M

1 (c)
Calculate the numerical aperture of a fibre with core index n

_{1}= 1.61 & cladding index n_{2}= 1.55.
3 M

1 (d)
What if the difference between spontaneous & stimulated emissions.

3 M

1 (e)
An electron is bound by a potential which closely approaches an infinite square well of width 2.5Å m. Calculate the first lowest permissible energy for electron.

3 M

1 (f)
Write any two applications of CRO.

3 M

1 (g)
What is MAGLEV?

3 M

2 (a)
What do you understand by anti-reflection coating? Derive conditions with proper diagram.

8 M

2 (b)
What is N.A.? Consider multimode step under fibre with n

_{1}= 1.53 and n_{2}= 1.50 and λ = 1μm. If the core radius = 50μm then calculate the normalised frequency of the fibre (V) and the number of guided mode.
7 M

3 (a)
What is the difference between holography & photography? Discuss the construction & reconstruction of image in holography with neat diagram.

8 M

3 (b)
Derive the condition for maxima and minima due to interference of light reflected from a thin film of uniform thickness.

7 M

4 (a)
What is the highest order spectrum which can be seen with monochromatic light of wavelength 6000Å by means of a diffraction grating with 5000 lines/cm.

5 M

4 (b)
Explain the Heisenberg's uncertainty principle.

5 M

4 (c)
What are type I & type II superconductors?

5 M

5 (a)
A plane diffraction grating just resolve two lines in the second order. Calculate the grating element if dλ = 6Å, λ = 6×10

^{-5}cm and the width of the ruled surface is 2cm.
5 M

5 (b)
Derive Schrodinger's time independent wave equation.

5 M

5 (c)
Explain the working of SEM with a neat diagram.

5 M

6 (a)
Find energy of neutrons in units of electronvolts where De-Broglie wavelength is 1Å.

Mass of neutron = 1.674 10

Plank's constant = 6.620 10

Mass of neutron = 1.674 10

^{-27}kgPlank's constant = 6.620 10

^{-34}J/sec.
5 M

6 (b)
Write a short note on electrostatic focusing.

5 M

6 (c)
What are carbon tubes and what are their properties.

5 M

More question papers from Applied Physics 2