Which one of the following statements concerning a virtual image produced by a mirror is true?
(c) A virtual image is always upright relative to the object. The magnification equation, , confirms that a virtual image (negative ) is always upright (positive ) relative to the object. Thus choice (d) never occurs (a virtual image cannot be inverted with respect to the object). Choice (e) also never occurs, as only real images can be photographed or projected onto screens, since only real images have actual light rays delivered to the image to expose film or scatter from a screen. Finally, a convex mirror produces virtual images which are smaller than the object, while a concave mirror, with object inside the focal point, produces a virtual image larger than the object. Thus neither (a) nor (b) is true. Questions 8 — 10 refer to the following situation: color n red 1.43 green 1.40 violet 1.37 • At what angle will the observer see green light? (d) Snell’s law tells us • Which physical phenomenon is illustrated by the fact that the observer will not see all three colors of light? (d)
