Mars subtends an angle of 8.0 10-5 rad at the unaided eye. An astronomical telescope has an eyepiece with a focal length of 0.035 m. When Mars is viewed using this telescope, it subtends an angle of 2.80 10-3 rad. Find the focal length of the telescope's objective lens.

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Pelican model 1600 Clear Plastic Micro Case for telescope eyepieces    US $.99

125mm huygens telescope eyepiece no barrel Meade new    US $.99

Meade triangle metal telescope tripod eyepiece tray NEW    US $1.49

I want to know what power a telescope that is 700mm x 700mm has?

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ANTIQUE BRASS ASTRONOMICAL TELESCOPE EYEPIECE TURRET JOHN BROWNING LONDON    US $135.83

ORION MEGAVISTA 168MM 125 70° TELESCOPE EYEPIECE    US $129.99

ORION OPTILUXE 2 50MM TELESCOPE EYEPIECE    US $69.99