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A giant telescope in an observatory has ...

A giant telescope in an observatory has an objective of focal length 19 m and an eye-piece of focal length `1.0 cm`. In normal adjustment, the telescope is used to view the moon. What is the diameter of the image of the moon formed by the objective? The diameter of the moon is `3.5 xx 10^(6)m`. and the radius of the lunar orbit round the earth is `3.8 xx 10^(8) m`.

A

10 cm

B

12.5 cm

C

15 cm

D

17.5 cm

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The correct Answer is:
D
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