MULTIPLE CHOICE QUESTIONS

1. [2082] Which one of the following phenomena is not explained by Huygen’s construction of wave front?
   a. refraction
   b. reflection
   c. polarization
   d. diffraction
2. [2081 GIE ‘A’] Which one of the following phenomena is explained by Huygen’s construction of wave front?
   a. refraction
   b. polarization
   c. dispersion
   d. origin of spectra
3. [2079 GIE ‘B’] Which of the following doesn’t explain wave theory of light?
   a. polarization
   b. interference
   c. diffraction
   d. photoelectric effect

Answers

1.c

2.a

3.d

THEORETICAL QUESTIONS

New Course

1. [2081 B/C] How can a plane wavefront be converted into a spherical wavefront? Justify. [2]
2. [2080 GIE ‘B’] State Huygen’s principle. Use it to verify Snell’s law. [1+2]
3. [2080 ‘P’]
   a.   How can a spherical wave front be changed into plane wavefront? Draw a diagram to justify your answer. [2]
   b.   Apply Huygen’s principle to verify the law of reflection of light. [3]
4. [2079 GIE ‘A’] State Huygens’ principle. [1]

Old Course

SHORT ANSWER QUESTIONS

5. [2076 GIE ‘A’] Differentiate between a plane wave front and a spherical wave front.
6. [2076 ‘B’] State Huygen’s principle. Does it apply to sound waves in air?
7. [2076 ‘C’, 2075 ‘A’, 2075 ‘B’, 2074 ‘S’, 2072 ‘C’] Distinguish between wave fronts and wavelets.
8. [2073 ‘S’] Differentiate between a plane wave front and a spherical wave front.
9. [2072 ‘E’] Explain with proper sketch, the differences between wavefronts and wavelets.
10. [2073 ‘D’] What is the difference between wave front and wavelets in the explanation of Huygen’s wave theory?

LONG ANSWER QUESTIONS

11. [2076 ‘C’] State and explain Huygen’s principle. Use the principle to verify the laws of refraction of light on the basis of wave theory.
    OR [2073 ‘C’] Describe Huygen’s principle with figure to prove the laws of reflection and refraction of light.
    OR [2072 ‘S’] What is Huygens’ principle? Show how refraction of light at a plane interface can be explained on the basis of wave theory of light.
    OR [2072 ‘D’] State and explain Huygen’s principle. Derive the laws of reflection on the basis of this principle.
12. [2075 ‘S’] What is meant by wavefront? Verify Snell’s law on the basis of wave theory of light.
13. [2074 ‘B’] What is a wavefront? Using Huygen’s principle prove that for a parallel beam of light incident on a reflecting surface, the angle of incidence is equal to angle of reflection.