Explanation Given: The focal length of objective is 225 cm and the focal length of eyepiece is 1.50 cm . Formula used: Magnification is the process of magnifying the images apparently. The objective lens of a telescope does not produce the magnified image of object, but make the object seem smaller than that actually is. It never magnifies the object. The eye piece magnifies the image angularly. Thus, it serves as just an angle magnifier. If the roles of objective and eyepiece lenses are reversed i.e. one sees through the objective of telescope instead of eyepiece, the distant objects will be seen reduced in angular size. Write the expression for the magnifying power of the reversed telescope. M = − f e f o ...... (1) Here, M is the magnifying power of the reversed telescope, f e is the focal length of eyepiece and f o is the focal length of objective

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Chapter 32, Problem 89P

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Factor by which angular size of object changed.

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Chapter 32, Problem 88P

Chapter 32, Problem 90P

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