A convex lens of focal length 30 cm and a concave lens of focal length 10 cm are separated by certain distance. A parallel beam of light is incident on the convex lens and the light emerging out of the combination is also parallel beam.Find the distance between the two lenses.

A convex lens of focal length 30 cm and a concave lens of focal length

1.	A convex lens of focal length 30 cm and a concave lens of focal length 10 cm are separated by certain distance. A parallel beam of light is incident on the convex lens and the light emerging out of the combination is also parallel beam.Find the distance between the two lenses.
A.	20 cm
B.	15 cm
C.	40 cm
D.	10 cm
Answer» B. 15 cm

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A convex lens of focal length 30 cm and a concave lens of focal length 10 cm are separated by certain distance. A parallel beam of light is incident on the convex lens and the light emerging out of the combination is also parallel beam.Find the distance between the two lenses.

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