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ALAGAPPA UNIVERSITY
KARAIKUDI – 630 003
UNIT BASED ONLINE EXTERNAL EXAMINATION - NOVEMBER – 2020

OPTICS AND SPECTROSCOPY 7BPH3C1

Total Marks: 25 Time: 1.0 Hr

SECTION A – SHORT ANSWER - 5 x 2 = 10 Marks

ANSWER ALL THE QUESTIONS

1. Why the Fraunhofer diffraction is called ‘Far Field Diffraction’?

2. Define resolving power. State Rayleigh criterion for resolution.

3. Define circular polarization.

4. Why the intensity of anti-stokes line less than that of stokes line?

5. What is molecular polarizability?

SECTION B - DESCRIPTIVE - 3 x 5 = 15 Marks

ANSWER ANY THREE

6. Discuss the theory of double slit Fraunhofer diffraction.

7. Derive the Grating equation sinθ = Gmλ.

8. Write the theory of half wave plate.

9. Explain vibrational Raman spectra.

10. Explain infrared spectroscopy.