101. The focal length of the converging lens is measured for violet, green and red colours. It is respectively f_v, f_g, f_r. We will find that

1. 1. f_y = f_r

   
   
   

   2. f_v > f_r

   
   
   

   3. f_v < f_r

   
   
   

   4. f_g > f_r

   
   
   

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   N/A

   Correct Option: C

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102. The function of the collimator in a spectrometer is

1. 1. To decrease the intensity of light

   
   
   

   2. To increase the intensity of light

   
   
   

   3. To obtain a parallel beam of light

   
   
   

   4. To obtain larger dispersion

   
   
   

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   N/A

   Correct Option: C

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103. The refractive index of a piece of transparent quartz is the greatest for

1. 1. Red light

   
   
   

   2. Yellow light

   
   
   

   3. Green light

   
   
   

   4. Violet light

   
   
   

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   N/A

   Correct Option: D

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104. When a ray of light enters a water filled glass tank from a glass face making a non zero angle to the normal, the emergent ray from the opposite face will follow a path which is

1. 1. Same

   
   
   

   2. Deflected to the right

   
   
   

   3. Deflected to the left

   
   
   

   4. Parallel but not same

   
   
   

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   N/A

   Correct Option: D

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105. If the refractive angle of a prism is 60° and the minimum deviation is 30°, then the angle of incidence is

1. 1. 30°

   
   
   

   2. 60°

   
   
   

   3. 45°

   
   
   

   4. 90°

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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