Green light shines through a 130-mm-diameter hole and is observed on a screen. if the hole diameter is increased by 20%, does the circular spot of light on the screen decrease in diameter, increase in diameter, or stay the same?

Increase in diameter

Explanation:

It is given that, Green light shines through a 130-mm-diameter hole and is observed on a screen.

Initial diameter,  

If the bole diameter is increased by 20 %, then the increased diameter can be calculated by finding 20% of the initial diameter.

Hence, it is clear that the circular spot of light on the screen increase in diameter.

Hence, the correct option is (b) " increase in diameter ".

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)