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1. The SI unit of power of the lens is
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
2. When a ray of light passes from a rarer to a denser medium the reflected ray is
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
3. The magnifying glass is
 
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  • (b) 
  • (c) 
  • (d) 
4. The periscope is used in
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
5. The position of the object in a compound microscope is
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
6. The colour which deviates the least during dispersion is
 
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  • (b) 
  • (c) 
  • (d) 
7. A convex lens does not produce a
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
8. The meaning of refraction in Latin language is
 
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  • (b) 
  • (c) 
  • (d) 
9. The distance between optic centre and principal focus of the lens is known as
 
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  • (b) 
  • (c) 
  • (d) 
10. The concave lens is a
 
  • (a) 
  • (b) 
  • (c) 
  • (d) 
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