zero error” and “backlash
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Q: A
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What is the “zero error” and “backlash” in the vernier calipers, screw gauges and travelling microscopes and how does it affect measurements being taken?
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- A simple refracting telescope with an objective lens with focal length 2.00m and and eye piece of with focal length of 2.0 cm is used to view Mars when it is 6 x 107km from the Earth. For the purposes of this question assume the unaided human eye can resolve objects 0.002 radians apart, what feature size can be seen on Mars with telescope? For the purpose of his problem assume that the diameter of the telescope is sufficiently large that diffraction does not play a role. o 2400 km o 1200 km o 3600 km o 120 kmQuestion:-The angular magnification of an astronomical telescope in normal adjustment is 36, and the diameter of the objective lens is 72mm. (Notice that this is the same configuration as a beam expander, see figure below which is NOT to scale. a. What is the minimum diameter of the eyepiece required to collect all the light entering the objective lens from a distant point source on the axis of the instrument? b. In order to use the thin lens approximation, the radius of curvature of the lens should be larger than the diameter of the lens itself. For a radius of curvature of 720mm for both sides of the objective lens (one is negative, one is positive), and an index of refraction of the objective glass of 1.5, what is the focal length of the Objective Lens?c. What is the focal length of the eyepiece given the focal length of the objective lens? d. What is the minimum length of the telescope? (i.e. the total distance between the eyepiece and the objective lenses).