## Wave Optics

**(Important Theory Questions)****Q1**. Define wave front. State Huygens principle and verify Snell’s law.

**Q2**. State Huygens principle and prove the laws of reflection on the basis of wave theory.

**Q3**. What do you mean by interference of light? Explain in brief the Young’s double slit experiment.

**Q4**. What are the coherent sources? Write the conditions for the sustained interference pattern. Also draw the intensity v/s path difference curve.

Q5. Find the conditions for constructive and destructive interference. How does the intensity depend on the width of slit?

Q6. Find the expression for the fringe width. What is the effect on the fringe width if the whole apparatus (YDSE) is completely immersed in a liquid of refractive index μ?

Q7. What do you mean by diffraction of light and state the condition for the diffraction? Obtain the conditions for secondary maxima and minima. Also draw the intensity distribution curve.

Q8. Prove that the width of central maxima is twice the width of the secondary maxima. How does the width of central maxima depend on the width of the slit?

Q9. State Brewster’s law and prove that the reflected and refracted rays are mutually perpendicular at the angle of polarization.

Q10. State law of Malus and draw an intensity V/s angle between the plane of transmission of polarizer and analyzer.

Q11. What is a Polaroid? How are they constructed? Mention their important applications.

Q12. Explain Polarization of light. Give any one method to produce plane polarized light.