John's face is 20 cm in front of a concave shaving mirror of focal length 30 cm. How large an image does he observe?

A) half as large as his face
B) of the same size as his face
C) twice as large as his face
D) three times as large as his face
E) four times as large as his face


D

Physics & Space Science

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Suppose two flat glass plates 30-cm long are in contact along one end and separated by a human hair at the other end. If the diameter of the hair is 50 ?m, find the separation of the interference fringes when the plates are illuminated by green light, ? = 546 nm

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The planet Mars reaches its closest point to the Earth approximately every

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