The Ontario high school physics. l focus is outside the lenses. The Huygens eyepiece has two plano-convexlenses (Fig. 437), the one next the eye having afocal length J that of the
Choosing a telescope By Andrew Johnston – NIAAS
A telescope objective of focal length 1m forms a real image of the moon 0.92cm in diameter. Calculate the diameter of the moon taking its mean distance for the earth to be 38 times 10^4 km . IF the telescope uses an eyepiece of 5cm focal length. What would ...
Objective lens of telescope forms :
astronomical optics, part 2: telescope & eyepiece combined