A reflecting telescope with a large objective mirror can collect more light from stars than a reflecting telescope with a smaller objective mirror. What other advantage is gained with a large mirror? Explain.
Answer to relevant QuestionsIn order to observe fine details of small objects in a microscope, should you use blue light or red light? If you are given two lenses with different focal lengths, how would you decide which should be used as the objective and which should be used as the eyepiece for a telescope? Explain. A senior citizen wears bifocals (Fig. 25.23) in which the top half of the lens has a focal length of – 0.850 and the bottom half of the lens has a focal length of + 0.500. What are this person’s near point and far point? A converging lens can give a maximum angular magnification of 4.0 x. What is the focal length of the lens? The focal length of the objective lens of a compound microscope is 4.5 mm. The eyepiece has a focal length of 3.0 cm. If the distance between the lenses is 18 cm, what is the magnification of a viewed image?
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