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If focal length of 15 m telescope is use...

If focal length of 15 m 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 moon is `3.48xx 10^6`m and the radius of lunar orbit is `3.8xx10^8 m ` .

Text Solution

Verified by Experts

Since the rays are incident from infinity , the image will be formed at focus.
`therefore` Diameter of the image
`=("diameter of moon" xx "image distance ")/("distance of moon")`
`=(3.48xx10^6xx15)/(3.8xx10^8)m =13.7 cm `
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