Physics – Short Questions

Optics

According to HSEB Exam format for Physics (XI), two short questions each of 2 marks are asked from Optics where any one must be answered. But there are many more questions to be prepared for, from various topics. Here are the selected short questions from the overall chapters of Optics which will not only save your exam preparation time but also help you score better marks.

  1. Define illuminance. Name the factors upon which it depends.
  2. The sun is less bright in the morning and in the evening as compared to the noon although its distance from the observer is almost the same. Explain.
  3. If a spherical mirror is immersed in water, does its focal length change? Explain with diagram.
  4. Does the focal length of a concave mirror depend on medium in which it is placed?
  5. Can a convex mirror ever form a real image? Explain with diagram.
  6. Is it possible to find whether a mirror is plane, concave or convex from the nature of image of an object? Explain.
  7. Why do stars twinkle?
  8. Why does the sun appear flattened at the time of sunset and sunrise?
  9. Why do in summer the roads often appear to be covered with water when seen from a distance?
  10. Can you ever have situation in which light ray goes undeviated through a prism?
  11. What are grazing incidence and grazing emergence?
  12. A convex lens is immersed in water. Will its focal length change? Explain.
  13. The focal length of a simple lens depends on the colour (wavelength) of light passing through it. Why? Is it possible for a lens to have a positive focal length from some colours and negative for others?
  14. Under what condition does a concave lens form a real image?
  15. Which of blue and red lights will be deviated more by a prism and why?
  16. Explain why a mirror cannot give rise to chromatic aberration.
  17. Distinguish between chromatic aberration and spherical aberration.
  18. When a ray of white light is passed through a glass prism, it is dispersed into different colours. But when it is passed through a rectangular glass slab, no colour is seen. Why?
  19. What is the cause of dispersion of light?
  20. Why does the sky appear blue?
  21. Why does the sun appear red at the time of sunset and sunrise?
  22. Why do far objects appear to be smaller than the nearer ones?
  23. What information can you get from the ‘f-number’ of a camera?
  24. What do you mean by accommodation of an eye?
  25. How can the magnifying power of a compound microscope be increased?

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