Reflection & Refraction

Transcription

1 Name: Anwer Key Date: Regent Phyic Tet # 14 Review Reflection & Refraction 1. Ue GUESS method and indicate all vector direction.. Term to know: electromagnetic pectrum, diffue reflection, regular reflection, refraction, index of refraction, Snell Law, total internal reflection, critical angle, diperion, monochromatic, interference, diffraction, diffraction grating, Young Double-Slit Diffraction Experiment, 3. Which color of light ha the highet frequency? Highet wavelength? Highet peed? Violet = high frequency Red = high wavelength All have ame peed 4. Which type of electromagnetic radiation ha the highet frequency? Highet wavelength? Highet peed? Gamma = high frequency Radio = high wavelength All have ame peed 5. How do fiber optic cable work? Platic or gla that ue total internal reflection to contain the information within the cable a it move 6. What i diperion? What caue it? Give an example. Diperion i when white light i eparated into different color after traveling through a ubtance with an index of refraction higher than air. The different color travel at different peed and are eparated. 7. Which color of light low down the mot when white light hine through a gla prim? Which color bend the mot from it traight-line path? Violet low the down the mot, cauing it to bend the mot 8. When a ray of light pae from a high index to a low index ubtance, which way will the ray bend? From a low index to a high index? High to low = low to fat = bend away Low to high = fat to low = bend toward 9. Why do light ray bend when they enter a ubtance? The light wave are lowed down by the different medium index of refraction. 10. Under what two condition will a light ray not bend? They will not bend if they enter at 0 0 or if the medium ha the ame index of refraction a the one the light jut left 11. What i the Law of Reflection? Snell Law? Reflection = Incident angle = reflected angle Snell = n1 inθ1 = n inθ 1. What i total internal reflection? When will it occur? Can it occur if the ray i traveling from a low index to a high index ubtance? From a high index to a low index ubtance? TIR = no refracted ray, it i completely reflected it occur when going from a higher to a lower 13. What i the critical angle? What i the angle of refraction when the angle of incidence i the critical angle? The refracted ray lie along the boundary of the two medium. It ha an angle of What are ome application of refraction? Telecope, archer fih, projector, camera, 15. Be able to calculate the angle of reflection, angle of refraction, critical angle, index of refraction, peed of light in a ubtance, and draw all thee angle. 16. A a light ray travel from a low index to a high index ubtance, what happen to it wavelength, peed, frequency, and period? Frequency and period tay SAME, peed decreae, wavelength decreae 17. What are ome example of the diffraction and interference of light? Mirage, rainbow 51

2 18. A ray of light traveling in air i incident on an air-diamond boundary a hown in the diagram. Draw the path of the light ray in the diamond. (An incident angle of 0 0 will pa traight through) All part of the wave cro at the ame time, o there i no bending! Air Diamond 19. Uing a protractor, draw and label the normal line and the reflected ray for each diagram below. Meaure and label the angle of incidence and the angle of reflection Acceptable Range: 48.0 o 5.0 o Acceptable Range: 53.0 o 57.0 o The diagram below repreent an interface between glycerol and zircon. A ray of light i hone through the glycerol, which trike the zircon and then pae through zircon. It trike the urface at the angle hown. a. Meaure and record the angle of incidence Angle of incidence = 34.0 o b. Calculate the angle of refraction a the light enter the zircon. n in 1.47 in in in 5.3 n 1.9 c. Draw the path of the light ray into the zircon, uing a protractor. d. Compare the peed of light in glycerol to the peed of light in zircon. The peed of light i lower in zircon than in glycerol becaue it ha a higher index of refraction, o it low light down more. e. If the wavelength of the light ray in the glycerol i 5.95 x 10-7 m, what i the wavelength of the light in the zircon? n 1 n1 1 n n 1 7 (1.47)( m) m Acceptable Range: 3.0 o 36.0 o Acceptable Range: Glycerol Zircon 34.0 o 5.3 o

3 1. The peed of light in a material i 1.81 x 10 /. What i the abolute index of refraction of the material? What i thi material? The index of refraction i unitle. Look up the material on the reference table. c n 1.66 v m Flint Gla. A ray of monochromatic light (f = 5.09 x Hz) i incident from air onto a odium chloride urface. a. How fat doe the light travel while in the odium chloride? Look up the index of refraction on the reference table. c v n 1.54 b. What i the wavelength of the light in the odium chloride? Frequency tay the ame from the air to the block. v f Hz 7 m 3. The following example depict a bird eye view of object located in front of plane mirror. For each object draw the reflected image. The image are reflection over the mirrored urface. Each point of the reflected image i the ame ditance from the mirror a the correponding point on the original figure 53

4 4. The peed of light in glycerol i approximately (A) 1.0 x 10 7 m/ (B).0 x 10 / (C) 4.4 x 10 / (D) 3.0 x 10 / 5. Refraction of a wave i caued by a change in the wave (A) peed (B) frequency (C) phae (D) amplitude 6. What occur a a ray of light pae from air into water? (A) The ray mut decreae in frequency (B) The ray mut increae in frequency Quetion 7 through 9 refer to the following: (C) The ray mut decreae in peed (D) The ray mut increae in peed c v n 1.47 Water ha a higher n value o light move lower The diagram below repreent a beam of monochromatic light (λ = 5.9 x 10-7 m) traveling from Lucite into air. 7. What i the meaure of the angle of refraction? [Ue a protractor or a mathematical calculation.] (A) 19 0 (B) (C) 49 0 (D) The peed of the light in Lucite i (A) 1.5 x 10 / (B) 4.5 x 10 / (C) 3.0 x 10 / (D).0 x 10 / 9. A light ray traveling in air enter a econd medium and it peed low to 1.71 x 10 eter per econd. What i the abolute index of refraction of the econd medium? (A) 1.00 (B) (C) 1.75 (D) The peed of light in a material i.5 x 10 /. What i the abolute index of refraction of the material? (A) 0.83 (B) 7.5 (C) 1. (D) A ray of light trike a mirror at an angle of incidence of What i the angle of reflection? (A) 30 0 (B) 0 0 (C) 90 0 (D) 60 0 in n in 1.50 in(30. ) in n n nv c v n 1.50 (1.00)( ) 1 1 v c n v.5 10 i r What i the approximate peed of light in alcohol? (A). x 10 / (B) 4.4 x 10 / (C) 3.0 x 10 / (D) 1.4 x 10 / c v n A a ray of monochromatic light enter a block of flint gla from air, it peed (A) increae (B) decreae (C) remain the ame 54 Flint gla ha a higher n value o light move lower

5 34. A ray of monochromatic light traveling in air enter a rectangular gla block obliquely and trike a plane mirror at the bottom. Then the ray travel back through the gla and trike the air-gla interface. Which diagram below bet repreent the path of thi light ray? [N repreent the normal to the urface.] Light bend toward the normal when it enter flint gla. The light reflect off the mirror at the ame angle. Light bend away from the normal when it return to the air 35. The abolute index of refraction for a ubtance i.0 for light having a wavelength of 5.9 x 10 7 meter. In thi ubtance, what i the critical angle for light incident on a boundary with air? (A) 45 0 (B) (C) (D) A beam of white light entering a gla prim obliquely and emerging a a band of color illutrate the proce of (A) diffraction (B) reflection (C) diperion (D) interference 37. A ray of light trike a plane mirror at an angle of incidence equal to The angle between the incident ray and the reflected ray i (A) 0 0 (B) 70 0 (C) 35 0 (D) A ray of light (λ = 5.9 x 10-7 m) traveling in air i incident on an interface with medium X at an angle of The angle of refraction for the light ray in medium X i 1 0. Medium X could be (A) flint gla (B) corn oil (C) diamond (D) alcohol 39. When a ray of light trike a mirror perpendicular to it urface, the angle of reflection i (A) 60 0 (B) 0 0 (C) 90 0 (D) 45 0 in 40. A light ray i incident on a plane mirror a hown in the diagram below. c 1 1 in n i r 35 Add the angle to get total between. n in 1.00 in(30. ) 1 1 n.4 in in(1 ) Perpendicular to the mirror i over the normal which i zero degree i r Which ray bet repreent the reflected ray? (A) A (B) B (C) C (D) D 55

6 Anwer: Flint gla. a x 10 / 4. B 5. A 6. C 7. C 8. D 9. C 30. C 31. D 3. A 33. B 34. C 35. D 36. C 37. B 38. C 39. B 40. C 41. D 4. C 43. B 44. A 45. B 46. A 47. B b x 10-7 m claroom 41. In a vacuum, all electromagnetic wave have the ame (A) wavelength (B) frequency (C) energy (D) peed 4. The diagram below repreent an object on the reflecting ide of a plane mirror. Which arrow bet repreent the image produced by the mirror? The arrow reflect over the axi. The point that are cloet reflect cloet. Quetion 43 through 47 refer to the following: The diagram below repreent a ray of monochromatic violet light wave (λ = 4.0 x 10-7 m) paing from air through Lucite and then into air again. 43. Compared to the peed of the violet light in air, the peed of the violet light in Lucite i (A) greater (B) le (C) the ame 44. Compared to angle A, angle B i (A) the ame (B) maller (C) larger 45. The apparent wavelength of thee light wave in Lucite i (A) 4.0 x 10-7 m (B).7 x 10-7 m (C) 6.4 x 10-7 m (D) 6.0 x 10-7 m 46. The frequency of thee light wave in air, in hertz, i (A) 7.5 x (B) 7.5 x (C) 1.3 x (D) 1.3 x Lucite ha a higher n value o light move lower The light return to it original angle when returning to it original material. n n 47. Compared to the frequency of wave of violet light in air, the frequency of wave of violet light in Lucite i (A) le (B) the ame (C) greater (4.010 m) 1.50 v f m 7 Frequency doe not change when entering a new material. 56 c o 3. See heet in , a b e x 10-7 m