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An astronomical telescope consists of two thin lenses set 36 cm apart and has a magnifying power of 8 in normal adjustment.

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An astronomical telescope consists of two thin lenses set 36 cm apart and has a magnifying power of 8 in normal adjustment. Calculate the focal lengths of lenses.

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In the normal adjustment, the final image is formed at infinity.

In the normal adjustment, the final image is formed at infinity.

From equations (i) and (ii), we have

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