61. An endoscope is employed to view the internal parts of the body organ. It is based on the principle of

1. 1. Reflection

   
   
   

   2. Internal reflection

   
   
   

   3. Refraction

   
   
   

   4. Dispersion

   
   
   

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   N/A

   Correct Option: B

   N/A

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62. Total internal reflection of light is possible when light enters from

1. 1. Air to glass

   
   
   

   2. Vacuum to air

   
   
   

   3. Air to water

   
   
   

   4. Water to air

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: D

   N/A

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63. Which of the following types of light are strongly absorbed by plants ?

1. 1. Violet and orange

   
   
   

   2. Blue and red

   
   
   

   3. Indigo and yellow

   
   
   

   4. Yellow and violet

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

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64. A compound microscope has a magnification of 30. The focal length of eye piece is 5 cm. If the final image is formed at the least distance of distinct vision (25 cm) the magnification produced by the objective is

1. 1. 5

   
   
   

   2. 7.5

   
   
   

   3. 10

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

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65. The phenomenon of splitting white light into seven colours is called

1. 1. Reflection

   
   
   

   2. Refraction

   
   
   

   3. Refractive index

   
   
   

   4. Dispersion

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: D

   N/A

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