1.

Two lenses of power 6D and ? 2D are combined to form a single lens. The focal length of this lens will be [MP PET 2003]

A.            \[\frac{3}{2}\] m                 
B.            \[\frac{1}{4}\]\[m\]
C.            4 m
D.             \[\frac{1}{8}\]\[m\]
Answer» C.            4 m


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