Real image (such as the images on the right), real rays of light are always represented by full, solid lines; perceived or extrapolated rays of light are represented by dashed lines. A real image occurs where rays converge, whereas a virtual image occurs where rays only "appear" to converge. Real images can be produced by concave mirrors and converging lenses, only if the object is placed further away from the mirror/lens than the focal point and this real image is inverted. As the object approaches the focal point the image approaches infinity, and when the object passes the focal point the image
What If (story) is implied to be What, but whether this is true or not is left to the reader.) On the device's screen, Mr. If shows the couple scenes from their earlier lives and what might have happened if certain minor but pivotal events had not occurred. Eventually they learned that even if the pivotal event wouldn't occur, the result would eventually be the same. The theme of major events being altered by relatively minor changes would recur in Asimov's 1955 novel "The End of Eternity" and his 1958 short story "Spell My Name with an S". The story's theme and idea