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.
Answer to relevant QuestionsWhat are the powers of (a) A converging lens of focal length 20 cm and (b) A diverging lens of focal length – 50cm? A college professor can see objects clearly only if they are between 70 and 500 cm from her eyes. Her optometrist prescribes bifocals (Fig. 25.23) that enable her to see distant objects through the top half of the lenses and ...An object is placed 10 cm in front of a converging lens with a focal length of 18 cm. What are (a) The lateral magnification and (b) The angular magnification? A compound microscope has an objective with a focal length of 4.00 mm and an eyepiece with a magnification of 10.0x. If the objective and eyepiece are 15.0 cm apart, what is the total magnification of the microscope? A lens with a power of + 10 D is used as a simple microscope. (a) For the image of an object to be seen clearly, can the object be placed infinitely close to the lens, or is there a limit on how close it can be? Explain. ...
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