Answer any five

1(a)
A Light of wavelength 5880 A°.is inclined film of glass of R.I =1.5 such that the angle of refraction in the plate is 60°. Calculate the smallest thickness of the plate which will make it dark by reflection.

3 M

1(b)
What is grating and grating element?

3 M

1(c)
Define the terms:

(i) Total internal reflection

(ii) Numerical Aperture

(ii) Acceptance angle.

(i) Total internal reflection

(ii) Numerical Aperture

(ii) Acceptance angle.

3 M

1(d)
Differentiate Spontaneous and stimulated emission of radiation.

3 M

1(e)
An electron is bounded in one dimensional potential well width 2A° But of infinite height.Find its energy values in second excited state.

3 M

1(f)
In phase measurement by Lissajous pattern ellipse is obtained with major axis of 2cm and minor axis of 0.8 cm. Calculate phase change.

3 M

1(g)
Why is superconductor termed as 'Perfect Diamagnet'.

3 M

2(a)
With proper digram and necessary expressions explain how Newton's ring experiment is useful to determine the radius of curvature of planoconvex lens.

8 M

2(b)
Derive the expression for numerical Aperture for a step index fibre. The N. A. of an optical fiber is 0.5 and core R.l. is 1.54. Find refractive index of cladding.

7 M

3(a)
With neat energy level diagram describe the construction and working of He-Ne laser.

8 M

3(b)
Explain the interference in then parallel film and derive the expression for path difference between reflected, rays, hence obtain the conditions of maxima and minima for interference with monochromatic light.

7 M

4(a)
For plane transmission grating prove that dsin θ =nλ, n= 1,2,3, ...

5 M

4(b)
What is Heisenberg's uncertainty principle ? Prove that electron cannot survive in the nucleus.

5 M

4(c)
Differentiate Type-I and Type-II superconductors.

5 M

5(a)
Calculate the minimum no. of lines in a grating which will just resolve in the first order whose wavetengths are, 5890 A° and 5896 A°.

5 M

5(b)

Derive one dimensional time dependent Schrodinger equation for matter wave.

5 M

5(c)
Explain with neat diagram principle and working of SEM.

5 M

6(a)
An electron and a photon each have a wavelength of 2A°. What are their momentum and energies ?

5 M

6(b)
Explain construction and working of cathode ray Oscilloscope.

5 M

6(c)
What are carbon nano tubes? Write their properties.

5 M

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