21. The ratio of the speed of light in a medium to a vacuum is called . . . . . . . . .
22. When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because the
23. Which one of the colours has the longest wavelength?
24. The speed of light with the rise in the temperature of the medium
25. An air bubble in water will act like a
26. Consider the following statements.
1. The minimum size of a mirror required to see the full image of a person is half the height of the person.
2. A convex mirror always forms a virtual, erect and diminished image.
3. The laws of reflection are true for all reflecting surfaces.
4. The focal length of a plane mirror is zero.
Which of the statement(s) given above is/are correct?
1. The minimum size of a mirror required to see the full image of a person is half the height of the person.
2. A convex mirror always forms a virtual, erect and diminished image.
3. The laws of reflection are true for all reflecting surfaces.
4. The focal length of a plane mirror is zero.
Which of the statement(s) given above is/are correct?
27. In which of the following mirror size of image formed is always equal to the size of object?
28. Polaraids are used
29. Which of the following does not have an optical lens?
30. Which of the following is located on the polished surface of the mirror?
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