Three lenses in contact have a combined focal length of 20 c... — NEET TEST | Mockzy | Mockzy

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Three lenses in contact have a combined focal length of 20 cm. If the third lens is removed, the combined focal length becomes 15 cm. The third lens is:

A

A converging lens of focal length 60 cm

B

A diverging lens of focal length 60 cm

C

A diverging lens of focal length 30 cm

D

A converging lens of focal length 30 cm

A uniform rod of length 1.2 m stands vertically on a floor. It falls over withou

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