An optical instrument uses eye-lens of power 16 D and objective lens of power 50D and has a tube length of 16.25 cm. Name the optical instrument and calculate its magnifying power if forms the final image at infinity.

An optical instrument uses eye-lens of power 16 D and objective lens o

1.	An optical instrument uses eye-lens of power 16 D and objective lens of power 50D and has a tube length of 16.25 cm. Name the optical instrument and calculate its magnifying power if forms the final image at infinity.
Answer» `P_(e) = 16 D rArrf_(e) = 1/P_(e)=1/16 m = 100/16 cm =25/4cm` `P_(0)=50 D rArr f_(0) = 1/ P_(d)=1/50 m=100/50 cm=2 cm` `f_(e) = 25/4 cm and f_(0) = 2 cm` length of tube = l= 16.25 cm Optical instrument is compound microscope. `M= L/(f_(0)) xx D/(f_(e))" " =16.25/2 xx cancel (25)/cancel (25)_(4)=16.25 xx 2` M=32.5

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An optical instrument uses eye-lens of power 16 D and objective lens of power 50D and has a tube length of 16.25 cm. Name the optical instrument and calculate its magnifying power if forms the final image at infinity.

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