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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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