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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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Similar questions

Q. A giant telescope in an observatory has objective of focal length 19 m and an eyepiece of focal length 1.0 cm. In normal adjustment, the telescope is used to view the moon. What is the diameter of image of the moon formed by the objective?
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Q. (a) A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length 1.0cm is used, what is the angular magnification of the telescope? (b) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 × 106m, and the radius of lunar orbit is 3.8 × 108m.

Q. A) A giant refracting telescope at an observatory has an objective lens of focal length

15 m

. If an eyepiece of focal length

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is used, what is the angular magnification of the telescope?

B) A giant refracting telescope at an observatory has an objective lens of focal length 15 m and an eyepiece of focal length

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3.48 \times 10^{6} m

, and the radius of lunar orbit is

3.8 \times 10^{8} m

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.

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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