TASK DEFINITION: Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
PROBLEM: Almost all surfaces reflect some of the light that strikes them. The still water of the lake in Figure 22.9 reflects almost all of the light that strikes it. The reflected light forms an image of nearby objects. An image is a copy of an object that is formed by reflected or refracted light. If a surface is extremely smooth, like very still water, then an image formed by reflection is sharp and clear. This is called regular reflection. If the surface is even slightly rough, an image may not form, or if there is an image, it is blurry or fuzzy. This is called diffuse reflection. Both types of reflection are represented in Figure 22.10. You can also see animations of both types of reflection at this URL: [Link] In Figure 22.10, the waves of light are represented by arrows called rays. Rays that strike the surface are referred to as incident rays, and rays that reflect off the surface are known as reflected rays. In regular reflection, all the rays are reflected in the same direction. This explains why regular reflection forms a clear image. In diffuse reflection, in contrast, the rays are reflected in many different directions. This is why diffuse reflection forms, at best, a blurry image. One thing is true of both regular and diffuse reflection. The angle at which the reflected rays bounce off the surface is equal to the angle at which the incident rays strike the surface. This is the law of reflection, and it applies to the reflection of all light. The law is illustrated in Figure 22.11 and in the animation at this URL: Mirrors are usually made of glass with a shiny metal backing that reflects all the light that strikes it. Mirrors may have flat or curved surfaces. The shape of a mirrors surface determines the type of image the mirror forms. For example, the image may be real or virtual. A real image forms in front of a mirror where reflected light rays actually meet. It is a true image that could be projected on a screen. A virtual image appears to be on the other side of the mirror. Of course, reflected rays dont actually go behind a mirror, so a virtual image doesnt really exist. It just appears to exist to the human eye and brain. Most mirrors are plane mirrors. A plane mirror has a flat reflective surface and forms only virtual images. The image formed by a plane mirror is also life sized. But something is different about the image compared with the real object in front of the mirror. Left and right are reversed. Look at the man shaving in Figure 22.12. He is using his right hand to hold the razor, but his image appears to be holding the razor in the left hand. Almost all plane mirrors reverse left and right in this way. Some mirrors have a curved rather than flat surface. Curved mirrors can be concave or convex. A concave mirror is shaped like the inside of a bowl. This type of mirror forms either real or virtual images, depending on where the object is placed relative to the focal point. The focal point is the point in front of the mirror where the reflected rays intersect. You can see how concave mirrors form images in Figure 22.13 and in the interactive animation at the URL below. The animation allows you to move an object to see how its position affects the image. Concave mirrors are used behind car headlights. They focus the light and make it brighter. They are also used in some telescopes. The other type of curved mirror, a convex mirror, is shaped like the outside of a bowl. This type of mirror forms only virtual images. The image is always right-side up and smaller than the actual object, which makes the object appear farther away than it really is. You can see how a convex mirror forms an image in Figure 22.14 and in the animation at the URL below. Because of their shape, convex mirrors can gather and reflect light from a wide area. This is why they are used as side mirrors on cars. They give the driver a wider view of the area around the vehicle

SOLUTION: Concave mirrors are used

PROBLEM: Our clothes are a powerful tool that can make us feel better about ourselves. One way in which this works is by wearing different color1s of clothes. Normally when we are sad, we will wear dark color1ed clothes. Oppositely, when we are happy, we often choose to wear brightly color1ed clothes. The reason for this is that our choice of color1 mirrors is how we are feeling. Those who don't believe in the idea are often heard saying, "if only this truly worked". Well in reply to those people, there has been a lot of research into what happens to someone's feelings when they are asked to wear just one color1 of clothes. It has been proven that if we wear particular color1s of clothes they can change our feelings. Suppose we are feeling sad, if we wear black we may begin to feel worse. However, if we wear green, red or yellow, we may begin to feel better. Each color1 is said to have its own healing power. So remember, if you are not feeling your best, you can always try out some different color1ed clothes. If one color1 has no effect on your feelings, maybe another will.

SOLUTION: What's the author's attitude toward "wearing particular color1s of clothes can change our feelings"?

PROBLEM: BACKGROUND Fractionated plasma separation and absorption (FPSA) is an extracorporeal liver support method that detoxifies accumulated toxins. There are limited data of its use in the treatment of Amanita phalloides intoxication. The objective of this study was to investigate whether FPSA before liver transplantation improves patients' short-term post liver transplantation survival in Amanita phalloides poisoning. MATERIAL AND METHODS The study population consisted of ten patients who had liver transplantation (LT) due to acute liver failure (ALF) caused by Amanita phalloides poisoning. Six patients were treated with FPSA before liver transplantation. All the patients who were started on FPSA were also placed on the liver transplantation list according to emergent liver transplantation criteria. RESULTS Patients treated with FPSA were in a more severe clinical condition presenting in higher mean MELD, total bilirubin, INR and ammonia along with more frequent hypoglycemia and hepatic encephalopathy grade 3/4. FPSA group had longer mean waiting time on the recipient list (3.5 vs. 1.25 days) but inferior thirty-day survival rate (16.5% vs. 100%). CONCLUSIONS When conservative medical modalities are ineffective, the only treatment for Amanita phalloides poisoning is a liver transplant. Although FPSA treated patients had inferior post-LT survival, FPSA was found to prolong the pre surgical waiting time for critically ill patients, consequently giving a chance of life-saving procedure.

SOLUTION:
Which mushroom is poisonous, Amanita phalloides or Agaricus Bisporus