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A telescope has objective lens of focal ...

A telescope has objective lens of focal length 15m. 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 xx 10^6m`, and the radius of lunar orbit is `3.8 xx 10^8m`.

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PSEB-RAY OPTICS AND OPTICAL INSTRUMENTS-EXERCISE
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  3. A telescope has objective lens of focal length 15m. If this telescope ...

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  17. A screen is placed 90cm from an object. The image of the object on the...

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