A lens of focal length 10 cm is placed in contact with a lens of focal length −15 cm. What is the focal length of the combination?
A) -15 cm
B) 6.0 cm
C) 7.5 cm
D) −5.0 cm
E) 30 cm

Question

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The Answer of A lens of focal length 10 cm is placed in contact with a lens of focal length −15 cm. What is the focal length of the combination?
A) -15 cm
B) 6.0 cm
C) 7.5 cm
D) −5.0 cm
E) 30 cm

A Lens of Focal Length 10 Cm Is Placed in Contact