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Question


Which of the following is correct assuming new cartesian sign convention?

A

u = 15 cm, R = 30 cm

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B

u = -15 cm, R = 30 cm

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C

u = -15 cm, R = -30 cm

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D

u = 15 cm, R = -30 cm

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Solution

The correct option is B

u = -15 cm, R = 30 cm


As the object distance is to left of pole,
u=15 cm

Radius of cuvature to the right. So,
R=30 cm

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