Q21. What do you mean by ‘point of incidence’?


Q22. How we see the moon?


Q23. What are the two types of reflection of light?


Q24. What is a ' reflected ray'?


Q25. What is angle of reflection?


Q26. What are the uses of periscope?


Q27. Write the uses of kaleidoscope.


Q28. What are luminous objects? Give some examples.


Q29. What are illuminated objects? Give one example.


Q30. Why cannot we see a book which is placed behind a wooden screen?


Q31. What is blind spot in the eye?


Q32. What type of image is formed by a plane mirror?


Q33. What is lateral inversion?


Q34. What is the most comfortable distance at which one can read with a normal eye?


Q35. What is meant by dispersion of light'? Name a natural phenomenon showing dispersion.


Q36. A ray of light is incident on a plane mirror at an angle of 40°. What is the angle of reflection?


Q37. Gurmit wanted to perform Activity 16.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teachers advise?


Q38. Which part of the eye gives it its distinctive color?


Last modified: Monday, 14 October 2019, 9:44 AM