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Image Formation by Spherical Lenses

Satyam is usi...

Question

Satyam is using a telescope to observe the moon. The focal length of the lens is $- 3 m$ . Find out the image size of the moon. (Diameter of the moon is $3.5 \times 10^{6} m$ and distance between moon and earth is $3.5 \times 10^{8} m$ )

A

7 cm

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B

3.5 cm

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C

3 cm

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D

35 cm

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Solution

The correct option is C 3 cm
.

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Q. A telescope made of mirrors is used to observe the moon. It forms the inverted image of the moon at 3.5 km from the eye piece. Find the diameter of the image of the moon. Given the diameter of the moon is 1700 km and the distance of the moon from the earth is 350,000 km.

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