Question

11. (1 point) A photographer takes a picture of you, such that your image completely fills the frame. You don't like having your picture taken so you put a piece of duck tape over the camera lens. The photographer moves while you're doing this so the duck tape only covers the bottom half of the lens. When the photographer takes another picture of you, he will see A. The top half of your body, just as bright as before. B. The top half of your body, but dimmer now. C. All of your body, just as bright as before. D. All of your body, but dimmer now. 12. (1 point) A 6 foot tall person stands 1 foot in front of a 2 foot tall mirror. The mirror is positioned such that the top of the mirror is aligned with the top of the person's head. If the person now backs away from the mirror, will they begin to see more of their own body, less of their own body, or the same amount of their body?

11 & 12 please

Answer 1

11) When the photographer's cmera lens is covered on the lower part by a duck lens, the lower portion of the body is hidden. Further, since the numerical aperture(N.A.) of the lens decreases, less amount of light passes through the lens so that the image becomes dimmer than that seen previously when the lens was uncovered.

Thus, the photographer observes only the top half of the body which is dimmer, and thus, option B is correct.

12) A 6 foot tall person stands one foot infront of a 2 foot tall mirror. In this position, the top of the mirror is aligned with the top of the man's head. Thus, when the person backs that is moves backward, it will see more amount of his own body. The reason is that the farther the object is from the mirror, the smaller the image height will be and thus he can see more portion of his body than that he could see previously.