1.

If the focal length of a double convex lens for red light is \[{{f}_{R}},\] its focal length for the violet light is [EAMCET 2005]

A.            \[{{f}_{R}}\]                          
B.            Greater than \[{{f}_{R}}\]                                                               
C.            Less than \[{{f}_{R}}\]      
D.            \[2{{f}_{R}}\]                       
Answer» D.            \[2{{f}_{R}}\]                       


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