116. A convex lens made of a material of refractive index 1.5 and having a focal length of 10 cm is immersed in a liquid of refractive index 3.0 The lens will behave as a

1. 1. Converging lens of focal length 10 cm

   
   
   

   2. Diverging lens of focal length 10 cm

   
   
   

   3. Diverging lens of focal length 30 cm

   
   
   

   4. None of the above

   
   
   

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   N/A

   Correct Option: B

   N/A

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117. Two plane mirrors are inclined at a certain angle. A ray of light coming parallel to one of the mirrors is rendered parallel to the second mirror after two reflections The inclination between the mirror is

1. 1. 60°

   
   
   

   2. 90°

   
   
   

   3. 45°

   
   
   

   4. 30°

   
   
   

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   N/A

   Correct Option: A

   N/A

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118. A monochromatic beam of light passes from a denser to a rarer medium as a result its

1. 1. Velocity increases

   
   
   

   2. Velocity decreases

   
   
   

   3. Frequency decreases

   
   
   

   4. Wavelength decreases

   
   
   

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   N/A

   Correct Option: A

   N/A

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119. A person can not see clearly objects at a distance less than 100 cm. The power of the spectacles required to see clearly objects at 25 cm is

1. 1. + 1 D

   
   
   

   2. + 3 D

   
   
   

   3. + 4 D

   
   
   

   4. + 2 D

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

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120. In the case of hypermetropia

1. 1. The image of a near object is formed behind the retina

   
   
   

   2. The image of a distinct object is formed in front of the retina

   
   
   

   3. A concave lens should be used for correction

   
   
   

   4. A cylindrical lens should be used for correction

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: A

   N/A

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