Chapter 9 : Light – Reflection and Refraction
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50. A concave mirror is used in torches because it:
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49. The angle between reflected ray and normal is called:
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48. Virtual images cannot be obtained on a:
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47. Real images can be obtained on a:
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46. The unit of focal length is:
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45. The power of a lens of focal length 50 cm is:
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44. The far point of a normal eye is:
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43. The least distance of distinct vision for a normal eye is:
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42. Hypermetropia is corrected using:
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41. Myopia is corrected using:
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40. A convex lens used to correct hypermetropia is called:
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39. The optical centre of a lens is the point through which light passes:
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38. The lens formula is:
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37. The image formed by a convex mirror is located:
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36. The image formed by a concave mirror when object is at focus is formed at:
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35. The image formed by a concave mirror for object beyond C is:
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34. If magnification is positive, image is:
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33. Magnification produced by mirrors is given by:
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32. The mirror formula is:
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31. The distance between pole and focus is called:
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30. The image formed by a plane mirror is how many times the object size?
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29. The focal length of a convex mirror is taken as:
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28. The focal length of a concave mirror is taken as:
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27. When light travels from rarer to denser medium, it bends:
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26. When light travels from denser to rarer medium, it bends:
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25. The refractive index of water is approximately:
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24. Refractive index depends upon:
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23. Speed of light is maximum in:
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22. The phenomenon of bending of light when it passes from one medium to another is called:
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21. The image formed by a concave lens is always:
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20. The image formed by a convex lens when object is at infinity is formed at:
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19. A convex lens converges rays because it is:
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18. A concave lens is also known as:
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17. A lens with positive power is:
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16. Power of a lens is the reciprocal of:
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15. The SI unit of power of a lens is:
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14. The mirror used as rear-view mirror in vehicles is:
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13. A convex mirror always forms image which is:
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12. A ray parallel to the principal axis after reflection from a concave mirror passes through:
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11. A ray passing through the centre of curvature of a concave mirror after reflection:
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10. The radius of curvature of a spherical mirror is:
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9. The centre of the reflecting surface of a spherical mirror is called:
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8. The reflecting surface of a convex mirror is:
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7. The reflecting surface of a concave mirror is:
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6. A concave mirror can form:
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5. The focal length of a plane mirror is:
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4. The image formed by a plane mirror is:
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3. Which law states that angle of incidence is equal to angle of reflection?
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2. The angle between the incident ray and the normal is called:
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1. The bouncing back of light from a surface is called:
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