The diagram shows a candle placed in front of a curved mirror. Where is the image located if do = 7.5 cm and f= -10.0 cm?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

Ineed the answer to question 1 , i’m desperate

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.