A thin converging lens and a thin diverging lens of each focal length – McqOptions

MCQOPTIONS

1.	A thin converging lens and a thin diverging lens of each focal length 10 cm are placed coaxially 5cm apart. What will be the focal length of the combination?
A.	+10cm
B.	-10cm
C.	+20cm
D.	-20cm
Answer» D. -20cm

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