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The focal lengths of the eyepiece and t...

The focal lengths of the eyepiece and the objective are 10 cm and 200 cm respectively . If someone wants to observe moon with naked eye through this telescope then what should be the distance between the objective and the eyepiece ?

Text Solution

Verified by Experts

If someone wants to observe moon with naked eyes then the telescope should be focussed at infinity
For focussing at infinity , length to the tube is
`L=f_(o)+f_e=200+10=210 cm `
Hence, distance between the two lenses is 210 cm .
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