# Practice Quiz (Viva Questions)

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Viva Questions Determine the wavelength of the laser light by diffraction grating and demonstration.

1. What is population Inversion?

2. What is spontaneous and stimulated emission process?

3. Why do you use n lembda= d sin theta formula? What is the origin to derive this formula for this experiment?

4. What is diffraction?

5. What is diffraction grating?

6. What is full form of the LASER?

7. What is Interference?

8. What is the condition for constructive interference?

9. How to find the grating element of a given diffraction grating having 1500 Lines Per Inch (LPI)?

10. What are the Laser light characteristics ?

11. What is the standard value of Red Color wavelength in He-Ne gas LASER?

12. What is grating Element?

13. What is the formula for to find the percentage error?

Observed value=A

Standard value=B

1. $Error&space;=&space;\frac{A-B}{B}\times&space;100$
2. $Error&space;=&space;\frac{A-B}{A}\times&space;100$
3. $Error&space;=&space;\frac{A-B}{2B}\times&space;100$
4. $Error&space;=&space;\frac{2A-B}{B}\times&space;100$

14. Does diffracted Waves can interfere?

## 3 Replies to “Viva Questions Determine the wavelength of the laser light by diffraction grating”

1. Stuti dhapola says:

Good questions.. looking forward for more on different topics and experiments as per the present bsc. Course