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or blue light of wavelength = 475nm, what is its frequency? What is the energy of its photon? 4. (a) What is the difference between

or blue light of wavelength = 475nm, what is its frequency? What is the energy of its photon? 4. (a) What is the difference between a refractor telescope and a reflector telescope? (b) what are their potential defects in image quality and how do you correct this defect? (c)Where to you place the eyepiece and why

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