PLEASE HELP!!! SCIENCE QUESTION!
2 answers:
Answer:
C. Electronic charges have electric fields surrounding them that allow them to exert forces on other objects without touching them.
Explanation:
All the electric charges have electric field in the region surrounding them
This electric field is given as
above formula is the electric field due to a point charge in the surrounding region of it.
Now due to this electric field when other charges comes into this region they will experience electric force on them which is given as
due to above reason two charges either attract or repel each other
so correct answer will be
C. Electronic charges have electric fields surrounding them that allow them to exert forces on other objects without touching them.
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Answer:
1.0 dioptres
Explanation:
Farsightedness is an eye defect in which a person can see far objects clearly but not near objects. That implies that the patients' near point is farther than 25cm which is the normal least distance of distinct vision.
Farsightedness results from the eyeball being too long or the crystalline lens not being sufficiently converging.
Carol is farsighted with a near point of about a meter (100cm). We desire to make a lens to enable her near point be reduced to about 50cm. The focal length and power of this lens is calculated in the image attached.
The power of a lens is the inverse of its focal length in meters hence the 100 in the formula for power of the lens.
