106. The image of an object formed by device is always virtual and small. The device may be

1. 1. Convex lens

   
   
   

   2. Concave mirror

   
   
   

   3. Concave lens

   
   
   

   4. None of these

   
   
   

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   N/A

   Correct Option: C

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107. Two sources of wave are called coherent if

1. 1. Both have the same amplitude of vibration

   
   
   

   2. Both produce waves of the same wavelength

   
   
   

   3. Both produce waves of the same wavelength having a constant phase difference

   
   
   

   4. Both produce waves having the same velocity

   
   
   

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   N/A

   Correct Option: C

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108. Line spectrum is given by

1. 1. Sun

   
   
   

   2. Mercury vapour lamp

   
   
   

   3. Candle

   
   
   

   4. Electric bulb

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

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109. When a ray of light is refracted by a prism such that the angle of deviation is minimum then

1. 1. The angle of emergence is equal to the angle of incidence

   
   
   

   2. The angle of emergence is greater than the angle of incidence

   
   
   

   3. The angle of emergence is smaller than the angle of incidence

   
   
   

   4. The sum of the angle of incidence and the angle of emergence is equal to 90°

   
   
   

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   N/A

   Correct Option: A

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110. Check the wrong statement (s)

1. 1. A concave mirror can give a virtual image

   
   
   

   2. A concave mirror can give a diminished virtual image

   
   
   

   3. A convex mirror can give a diminished virtual image

   
   
   

   4. All of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

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