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Question

The optical instrument with zero power is :
telescope
microscope
eyepiece
all of the above

A

eyepiece

B

telescope

C

all of the above

D

microscope

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Solution

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A telescope has a larger value of its focal length. we know that Power $P = \frac{1}{f}$
so because telescope has a larger focal length so it's power which is inversely related to its focal length is approximately equal to zero.
Thus the optical instrument with zero power is telescope because it is a system with large focal length.

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