81. What should be the focal lengths of the lenses used in the astronomical telescope?
82. What happens when the objective and the eyepiece of a telescope are interchanged?
83. What is the advantage of an astronomical telescope with image at Near Point (Least Distance of Distinct Vision) than that forming image at infinity?
84. What are the advantages and disadvantages of a terrestrial telescope over astronomical telescope?
85. Why is a binocular used though there is a telescope which has the same purpose?
86. What are the main advantages of a Galilean Telescope over the Astronomical and Terrestrial Telescopes?
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