Which of the following is a true statement about virtual images?

you cannot see a virtual image.
a virtual image must be larger than the object.
a virtual image is formed at the position from which the rays appear to have originated.
a virtual image must be upside down.

Which instrument is used to measure air temperature

Why do astronauts in the space shuttle weigh less?

You want to lose weight and have been trying to decide which type of fad diet is best for you. you ask your doctor, who responds that a. fad diets are a temporary fix but generally don't have any side effects b. fad diets can be used several times a year to maintain a healthy weight c. fad diets can be risky for your health and, in the long run, do not work d. fad diets should never be used one right after the other; there should be a break between them select the best answer from the choices provided. a b c d