Lesson 1: How Do We See Objects? PDF

Lesson 1 WORDS TO KNO\ light ray HOW DO WE SEE OBJECTS?...

Lesson 1 WORDS TO KNO\ light ray HOW DO WE SEE OBJECTS? visible lighr reflection I THE BIG IDEA. We see an object light reflects off it and.,( rHrNr ABotJT tr !i lmagine you are lookingfor WHAT TO KNO\ / "i something in a closet. Can you find it with the lights off? Can you find it with your eyes closed? Can you Earl see it behind the clothes or in a box? What helps you see what you al are looking for? sun The electromagnetic wave. Humani are not able to see other types of electromagnetic waves, such as'radio waves or heat, bui qome animals can. You can see the light from the sun; from a flashlight, or from any other I light source."How do you see objects that do not make their own light? First,,lighl q1ay.e!s in_a straigllt line frorn a soqrce. Second, the lighl hits : an object. You can see objects because light waves bounce, or reflect, off them. This is called reflection. Next, the reflected light travels in a : t, ,t.r'ight line from the object to your eye. You can see the obiect because it reflects light. ar t Light source lnformation.u" I light Lioht...' about the 'l I the l'Y")t- is sent from , eyes td the brain..." - I - I aa' I -." Light I -5 : Light I I ---__(reflected) I , ---- 'i is,prohibited. Unic 1| Sffucture, Funcrion, and lnformarion processing I masteryedqcation:,cotn1 [t],  11oW DO WE SEE OBIECTS? -E colors of light' Thg eye The eye has special cells that can sense different to see' sends this information to the brain, allowingyou Light cannot reach your eyes if they are closed'.or if something is lf there b;cking the light. lf there is low light, you see things differently' is no light, You cannot see at all' it look like it is Light on right when You look at yourself in a mirror? Where do ob;ects that reflect in a mirror I appear to be in relation to where they reallY are? Less light ^G; E travgls in straight How do we see obiects, in a mirror? Because light lines, the light strikes the mirror at an angle and reflects off of it at the sameangle.Thisiswhywhatyouseeinamirrordependsuponwhere you stand. Mirror angle b angle o The person can see the vase (bottom image) but not t}e table (top image). t Z ] masteryeducation.com I Science I Level D copvins is prohibited' WHAT I HAVE LEARNED' 1. How are we able to see objects? @ When the objects absorb light rays @ When light rays are reflected into our eyes @ When light rays come. from our eyes @ When we can feel light rays This is a model of a brightly lit office with two walls, a mirron and flowers. Use this model to ans\Mer questions 2 and 3. sI ':1.- r- 1 r.'i i3 -t. flower Wall : 1' 2. Wno can see the red flower without using the mirrorl { srercH tr Sketch the diagram and then qse @ Person 1 arrows to show how the light rays @ Person 2 reflect from the flower toward each ofthe three people's eyes. @ Person 3 Remember that light trauel{in @ No one a straight line and cannot pais through walls! 3.' wt o can see the red flower in the mirror? @ Person 1 @ Person 2 @ Person 3 @ No one copving is prohibited. Unit 1| Structure, Function, and lnformation Processing I masteryeducation.com I I ]  peW DOWE SEE OB]ECTSI nJ- boy sees? t \ T \ \ \\ r the robot' @ The source of light is the eyes, and the object is is the eyes' @ The source of light is the flashlight, and the object the flashlight' @ The source of light is the robot, and the object is is the robot' @ The source of iight is the flashlight, and the object I >m { 5. tn this model, the dashed gray.line shows the line of symmetry for I I { t Remember that an acute angle is less than 90' and an obtuse angle is greater than 90'. Also v x remember that when You fold a 600 picture along a line of sYmmetrY, the two sides match' Does thls red help you figure out the number of degrees in angle Y? Wall blue flower Which statement is true? @ Angle y is acute, so the Person can see the blue flower' Angle x * angle y : 17Oo and is obtuse' The person cannot @ see the blue flower. x * angle y : goo and is a right angle. The person can @ Angle see the blue flower. @ We cannot tell what angle y is, so we do not know if the Person can see the blue flower. Copying is prohibited. t 4l masteryeducation.com l Science I Level D  6. n periscope uses two mirrors to allow sailors to see what is on the surface of the ocean even when a submarine is underwater. Which picture correctly shows how light travels to allow the sailor to see the ship? @ i. @ @ 'i @ { { ,E copving is prohibited. Unit 1| Strucrure, Function, and lnformation Processing I masteryeducation,com I S ]