A Circular Coin Is 33

question 20

Multiple Choice

A circular coin is 33.3 cm from a concave spherical mirror.(Assume the coin is on the optical axis.) The image of the coin is produced 23.3 cm towards the mirror from its real position.Calculate the focal length of the mirror.

• A)15.4 cm
• B)7.69 cm
• C)13.7 cm
• D)27.4 cm
• E)10.0 cm

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An annual adjustment of clocks during the warmer months to extend evening daylight, typically by moving clocks forward by one hour.

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