Two lenses of power -15 D and +5 D are placed in contact with each oth – McqOptions

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1.	Two lenses of power -15 D and +5 D are placed in contact with each other. The focal length of the combination is:
A.	-10 cm
B.	+10 cm
C.	-20 cm
D.	+20 cm
Answer» B. +10 cm

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