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Draw the ray diagram of an astronomical telescope showing image formation in the normal adjustment position.

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Draw the ray diagram of an astronomical telescope showing image formation in the normal adjustment position. Write the expression for its magnifying power.

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∴ Magnifying power

Applying new Cartesian sign convention,

OB' f0 Distance of A 'B' from the objective along the incident light 

BE = –fe = Distance of A 'B' from the eyepiece against the incident light 

m = -f0/fe

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