111. Which of the following produce a virtual image smaller in size than the object?

1. 1. Concave lens

   
   
   

   2. Convex mirror

   
   
   

   3. Concave mirror

   
   
   

   4. Both (a) and (b)

   
   
   

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   N/A

   Correct Option: D

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112. A ray of light travelling inside a rectangular glass block of refractive index 2 is incident on the glass air surface at an angle of incidence of 45°. The refractive index of air is 1. The ray will

1. 1. Emerge into air without any deviation

   
   
   

   2. Be reflected back in to glass

   
   
   

   3. Be absorbed

   
   
   

   4. Emerged in to air with an angle of refraction equal to 90°

   
   
   

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   N/A

   Correct Option: D

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113. A diver in a lake wants to signal distress to a person sitting on the edge of the lake flashing his water proof torch. He should direct the beam

1. 1. Vertically upwards

   
   
   

   2. Horizontally

   
   
   

   3. At an angle to the vertical which is slightly less than critical angle

   
   
   

   4. At an angle to the vertical which is slightly more than critical angle

   
   
   

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   N/A

   Correct Option: C

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114. Two plane mirrors are placed perpendicular to each other. A ray strikes one mirror and after reflection falls on the second mirror. The ray after reflection from the second mirror will be

1. 1. Perpendicular to the original ray

   
   
   

   2. Parallel to the original ray

   
   
   

   3. At 45° to the original ray

   
   
   

   4. None of the above

   
   
   

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   N/A

   Correct Option: B

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115. When a ray or light enters a glass slab from air

1. 1. Its wavelength decreases

   
   
   

   2. Its wavelength increases

   
   
   

   3. Its frequency increases

   
   
   

   4. Neither its wavelength nor its frequency changes

   
   
   

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   N/A

   Correct Option: A

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