21. . . . . . . . . is used in yellow lamp street lights?
22. A curved mirror where the reflecting surface is curved inwards is called a
23. Which of the following statements about optical microscope is/are correct?
1. Both the eyepiece and objective of a microscope are convex lenses.
2. The magnification of a microscope increases with increases in focal length of the objective.
3. The magnification of a microscope depends upon the length of the microscope tube.
4. The eyepiece of a microscope is a concave lens.
Select the correct answer:
1. Both the eyepiece and objective of a microscope are convex lenses.
2. The magnification of a microscope increases with increases in focal length of the objective.
3. The magnification of a microscope depends upon the length of the microscope tube.
4. The eyepiece of a microscope is a concave lens.
Select the correct answer:
24. The Sun appears red during Sunset
25. Which one of the following statements is correct about the magnification of an optical microscope?
26. What is formula of mirror?
27. The phenomenon of light associated with the appearance of blue colour of the sky is
28. A plane glass slab is kept over coloured letters, the letter which appears least raised is
29. . . . . . . . . helps the eye to adjust the focal length of the lens.
30. When a beam of white light is allowed to fall on a prism, the maximum deviation of the emerging light occurs for
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