Answer:
Models,Mathematics
am not sure pliz mark brainliest
Explanation:
Answer:
Any incident ray traveling parallel to the principal axis of a converging lens will refract through the lens and travel through the focal point on the opposite side of the lens. ... These rays of light will refract when they enter the lens and refract when they leave the lens.
Hope this helps...
A. logic, would be your answer i believe!
Answer:
Explanation:
Given
Power Supplied
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Efficiency of the motor 
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So, vacuum cleaner delivers a power of 
Use of lubricant
Use of ball bearers
Use of streamlined body
Use of graphite