A positive lens of focal length 40 cm is placed 20 cm
A positive lens of focal length 40 cm is placed 20 cm behind a negative lens of focal length -80 cm. An object is placed 240 cm in front of the negative lens. The final image distance relative to the positive lens is:
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a positive lens of focal length 40 cm is placed 20 cm behind a negative lens of focal length -80 cm an object is placed
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