Q.
If two lenses of +5 dioptres are mounted at some distance apart, the equivalent power will always be negative if the distance is
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a
Greater than 40 cm
b
Equal to 40 cm
c
Equal to 10 cm
d
Less than 10 cm
answer is A.
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Detailed Solution
Using P=P1+P2−d×P1P2for equivalent power to be negatived×P1P2>P1+P2⇒d×25>10⇒d>1025m⇒d>10×10025⇒d>40cm
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