![]() Shown is a colour diagram of light bending as it refracts through material. The higher the index of refraction, the slower light travels in that medium. The index of refraction of a material is equal to the speed of light in a vacuum, divided by the speed of light in the material. This measurement is identified using the letter n. Every material has a unique index of refraction. The way light changes directions has to do with the properties of the material it is travelling through. This cart is labelled "Cart turns to the right."ent Index of Refraction It does not follow the yellow line of the other two.There is a red line under this cart, leading from the edge of the pavement, to a point near the top centre of the illustration. ![]() The front right wheel is labelled "Right wheel slows down." The front left wheel of the cart is labelled "Left wheel keeps going at the same speed."Ī third cart is completely on the green background. The front right corner of the second cart is on the green background, while the rest is on the grey. This illustrates that one cart is moving in a straight line, across the grey pavement, toward the grass. Two shopping carts are shown from above, along the yellow line. This is labelled "Pavement." The top is green and labelled "Grass." A straight yellow line stretches across the illustration, from near the lower right corner, to near the upper right corner. The bottom two thirds of the image is grey. Item contShown is a colour diagram of a shopping cart moving from pavement onto grass. Each of these angles are also labelled with the theta symbol and a lowercase, italicized i, and the theta symbol and a lowercase, italicized r. The right illustration is the same as the left, except that the angles of the arrows are further away from "Normal". The one leading to the "Reflected Light" arrow is labelled with a theta symbol and a lowercase, italicized r. The one leading to the "Incident Light" arrow is labelled with a theta symbol and a lower case, italicized i. This is labelled, "Reflected Light" in red letters. A red arrow points diagonally up and right from the top centre of the surface. This is labelled "Incident Light" in blue letters. In the left illustration, a blue arrow points diagonally, down and right, to top centre of the surface. These are labelled "Surface." Vertical, dashed lines stretch down the centre of each illustration, ending at the top centre of each rectangle. Shown are two colour illustrations of the angles of light reflecting off surfaces.īoth illustrations have a long, flat, grey rectangle along the bottom edge. ![]() The symbol Ɵ means “angle'' and arrows represent rays of light. The angle of incidence is equal to the angle of reflection.The perpendicular line we call the normal. ![]() The angle between the reflected light and a line perpendicular to the surface we call the angle of reflection. ![]() The angle between the incoming light and a line perpendicular to the surface we call the angle of incidence.
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