If AB -10 cm - DB -40 cm diameter- What is the radius of curvature - focal length-A- 40 cm - 5 cmB- 20 cm - 10 cmC- 40 cm - 10 cmD- 20 cm - 20 cm

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If AB =10 cm ...

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If AB = 10 cm & DB = 40 cm (diameter). What is the radius of curvature & focal length?

40 cm, 10 cm

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20 cm, 20 cm

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40 cm, 5 cm

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20 cm, 10 cm

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