CBSE Physics Physical Optics Expected Questions : Unit IX
Very Short Answer Type Question
Q. 1. Define wave front.
Answer
Q. 2. What is Huygen’s principle ?
Answer
Q. 3. What is interference of light ?
Answer
Q. 4. What becomes of the energy of light waves in destructive interference ?
Answer
Q. 5. Give the shape of interference rings observed in a Young’s double slit experiment.
Answer
Q. 6. When a low flying aircraft passes over head, we sometimes notice slight shaking of the picture on our TV screen. Suggest. % possible explanation.
Answer
Q. 7. Why do the oil films on the surface of water appear to be coloured ‘.’
Answer
Q. 8. What is diffraction of light ?
Answer
Q. 9. Why can we not get diffraction from a wide slit illuminated by a monochromatic light ?
Answer
Q. 10. Define polarization.
Answer
Q. 11. Two polaroids are placed at 90° to each other and the transmitted intensity is zero. What happens when one of them is rotated ?
Answer
Q. 12. What is quarter and half wave plate ?
Answer