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g Date Namé h » ! coNCEPTUAL ySIC PRACTICE PAGE a napter 28 Reflection and Refraction \ Refracfion 1.AP i Fini Positions of the wheels insi rections of travel. other side. Clearly indicate their paths and dj 2. Red, green, and blue rays of light are incident u pon a glass prism as shown below. The average speed of red light in the glass is less than in air, so the red ray is refracted. When it emerges into the air it regains its original speed and travels in the direction shown. Green light takes longer to get through the glass. Because of its slower speed it is refracted as shown. Blue light travels even slower in glass. Complete the diagram by estimating the path of the blue ray. 3. Below we consider a prism-shaped hole in a piece of glass—that is, an “air prism.” Complete the diagram, showing likely paths of the beams of red, green, and blue light as they pass through this “prism” and then into glass. RED GREEN BLUE 2 121

———7 CONCEPTUAL IlySI" PRAL bt ¢+ °~ Chapter 28 Reflection and Refraction Refraction—-continue when emerging from @ prism. Newton showed that wit, ith a llel again. Which placement of the SE:nu ng . Lig prism he co prism will do this? pearfisher sees the fish closer to the water Surfaceg 5. The sketch shows that dué to refraction Huey S than it actually is. a. Draw a ray beg at 50° to the normal @ ine of sight of the fish when it looks " Warg inning at the fish's eye to show the liné Of . Draw the direction of the ray after it meets the syr ace t the water surfac of water and continues in the air- b. At the 50° angle, does the fish see Huey OF does it see the reflected view of the starfish at th pottom of the pond? Explain. : ! e o refieced yigW of TRE - offiw JQ' 15 ek i3l pderh el Zefletan The £ish sess Th e Firicel - ohye of n the 50° path? Vel 15 1557k [ : : 05 ©5SThen YX™ Wil i e he ¢. To see Huey, shoulc_! the fi B yhr SO g ne ot Syt e it would see the world above in a 180° bove as seen beneath the water, wa}yeri the fish sees a normally ’1 80° re barely above the water surface, horizon. The fisheye view of the world @ fferent. Due to the 48° critical angle of mpressed within an angle of d. If the fish's eyes wel view, horizon to however, is very di horizon-to-horizon view €O

PRACTICE PAGE CONCEPTUAL PllySiC Chapter 28 Reflection and Refraction More Refraction-—continued 5. The two transparent blocks (right) are light made of different materials. The speed of light in the eft block is greater than the speed of light in the right block. Draw an appropriate light path through and beyond the right block. Is the light that emerges displaced more or less than light emerging from the left block? mare 6. Light from the air passes through plate different materials a of refraction” of the material). Construct system of four plates. \ Vg 5 t disp! >\\ s of glass and plastic below. The speeds of light j re shown to the right (these different speeds are often implied by ther] _!he a rough sketch showing an appropriate path throu:}??,: e Compared to the 50° incident ray at the top, what can you say about the angles of the ray in the air between and below the block pairs? jl""i. 5o 3 U=06¢ they change speed in passing from air rough sketch showing appropriate light ye (right below). 7. Parallel rays of light are refracted as into the eye (left below). Construct a paths when parallel light under water meets the same € air 8. Why do we need to wear a face mask or goggles to see clearly when under water? \ [{qht €5 fron wil +o eve tor ¢f gl peffadict bl U=c If a fish out of water wishes to clearly view objects in air, should it wear goggles filled with water or wi?\a air? 124

Date I R EPTUAL hySlC PRACTICE PAGE apter 28 Reflection and Refraction nses ys of light bend as shown when passing through the glass blocks. —A A5 g Show how light rays bend when they pass through the arrangement of glass blocks shown below. A _______ —_— e — . —7 . Show how light rays bend when they pass through the lens shown below. Is the lens a converging or a diverging lens? What is your evidence? BidSy Conlieging [t 3. Show how light rays bend when they pass through the arrangement of glass blocks shown below. 4.Show how light rays bend when they pass throu gh the lens shown below. Is the lens a converging or diverging lens? What is your evidence? 125