66. 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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   N/A

   Correct Option: A

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67. 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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   N/A

   Correct Option: B

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68. In a compound microscope, the intermediate image is

1. 1. Virtual, erect and magnified

   
   
   

   2. Real, erect and magnified

   
   
   

   3. Real, inverted and magnified

   
   
   

   4. Virtual, erect and reduced

   
   
   

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   N/A

   Correct Option: C

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69. An object is kept 5 cm in front of a concave mirror of focal length 15 cm. What will be nature of the image?

1. 1. Virtual, not magnified

   
   
   

   2. Virtual, magnified

   
   
   

   3. Real not magnified

   
   
   

   4. Real, magnified

   
   
   

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   N/A

   Correct Option: B

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70. An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm the image produced is

1. 1. Virtual and inverted

   
   
   

   2. Real and erect

   
   
   

   3. Real, inverted and diminished

   
   
   

   4. Real, inverted and of the same size as the object

   
   
   

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   N/A

   Correct Option: D

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