How do a combination of lenses helps in higher magnification?

How does control and cooridination take place in higher animals?

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How do refracting telescopes work?

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Three thin lenses are combined by placing them in contact with each other to get more magnification in an optical instrement. Each lens has a focal length of 3 cm. If the least distance of distinct vision is taken as 25 cm, the total magnification of the lens combination in normal adjustment is

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Answer the following questions : Observe the following figure and answer the questions How can we get different magnifications in this optical instrument ?