If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens ? the diameter of the moon is 3.48 × 10^{6} m and the radius of lunar orbit is 3.8 × 10^{8}m.

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#### Solution

Diameter of the image of the moon formed by the objective lens, *d* = α f_{0}

`=>d=`

`=>d=(3.48xx10^6)/(3.8xx10^8)xx15`

⇒d=0.135 m = 13.5 cm

Concept: Optical Instruments - The Microscope

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