1.

If two lenses of +5 diopters are mounted at some distance apart, the equivalent power will always be negative if the distance is                                                                        [BCECE 2005]

A.            Greater than 40 cm           
B.            Equal to 40 cm
C.            Equal to 10 cm                     
D.            Less than 10 cm
Answer» B.            Equal to 40 cm


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