exam 2 Solutions

exam 2 Solutions - - EX («M1 343%” Position: (your seat...

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Unformatted text preview: - EX («M1 343%” Position: (your seat #) ....... ../ Your Name: Last, First ................................................ .. Name of Workshop Instructor: Last, First ........................... .. Total points: 44:3; f=—;: (SI unitHz=s'1) Wigwam Wfifl Wellies. Inn. Pemiaim required for reproduction or fisplay. c=3x108 m/s (the speed of light) (5 8) ( l l -6) Wien: kT=2.898X10'3 Km WQMMW-Hflm In: i a: 5.6701x 10*8 W/(mstl) v=c/n, 7t=7t/n, n refractive index (14,16) reflection: ' 9i=9r WIS The hisGrauH—lfi W736, Int: Mission W Sm Woe-lien or d‘fiplayr 'Sneii’s iaw ' “(Sin (Elfini sin 9! . (23-4) refracnon V ‘ Cepyrignamekdmflmmpanesme nrmnerum» I r » ' Total internal ears“: , est-5:3) reflection ‘ Copyrightfi The mamas-Hal Companies. Em; Permission required in: Wu or display. equation: , ' ' v ' 1 , .11 _ i _. E; + E If (23 H!) 133an e The Miami-lit! Emmanies. hm Fermmn hr Winn or new; Magnifiwtien equation: :1: 2 L'- wje‘: (23—9) Brewster’s angle: 6,, = tan” 35 (23-6) "1* o o o I OOOOOOOIOIOOOOIOOIOOOOOOOOIIIUO..I.0. 0 Q1.(3pts) Calculate the critical angle for total internal reflection for a light ray exiting a material of refractive index 1.75 into air. Can total internal reflection occur for light entering such a medium from air ? Qiépts) The energy reaching the Earth from the Sun every second is approximately 1.7X1017 J/s. If the temperature of the Earth is to remain constant how much thermal radiation must the Earth emit ? Assuming the radius of the Earth is 6400 km estimate the average temperature of the Earth’s atmosphere (assume area=47rR2). If the maximum intensity of the Sun’s radiation occurs at 500 nm estimate the surface temperature of the Sun SNOW E:— H &} V‘i" q T _ 3L\ 6\ SQX\Q"1¢\?\V \L \‘m tow ' h K _ Q3. (3 pts) Explain what is meant by a light ray. What criterion must be satisfied'if the propagation of a light wave is to be successfully described in terms of rays ? “5 Q4. (/Z/pts) A white light source is Viewed through a combination of yellow and cyan filters. What color is perceived ? Explain your answer @545 pts) An object is placed at a distance of 10 cm fiom the center of a thin converging lens. The focal length of the lens is 20 0111. What is the distance of the image from the lens. Is it real or Virtual ? What is the ratio of the image size to object size ? Lzlni .LIF \P 0‘ : \4—L 1..-]. 72% lg, C‘ ——5 Sb Lb ‘1 a - g Q6. (8pts) An object of height 5cm is placed at distance ‘% cm from a converging mirror Whose focal length is I 20 cm. Sketch a ray diagram showing the location of the image. Is the image real or Virtual, upright or inverted ? Use the mirror/lens equations to find the location of the image and the size of the image. Q7. :1) (2pts) What is the angle of refraction when light passes from air into diamond at an angle of incidence of 450 . (assume the refractive index of diamond is 2.42). \(\\( \r: M1 SuS { v; ___v_\§_ r; Y (Qt :N‘C‘O ‘ b) (2pts) A beam of light passing is observed to be refracted on passing from water to air. The angle of incidence is 300 and the angle of the refracted beam is 41.70. What is the refractive index of water ? \cfithFFc’: stfmd" \AM: SUJHT‘L 0‘s :1 \8‘3 Q8. (3pts) Light is Viewed through a plane polarizing filter. This filter lets through lightwhose plane of polarization is vertical. What happens When a second vertically oriented polarizing filter is placed between the source and the observer ? Does the light intensity remain the same, increase or decrease ? What happens when this filter is rotated by 90° Explain your answer. We: mng we mam-J Mes 3W; Ms rum K mam Ma \‘3 MB “grit WW WC W3 N69? 19% WV \Mm * .Wmflw V Q9. (3pts) Sunlight reflected off a still lake is observed to be perfectly polarized for a particular angle of incidence Calculate this angle if the refractive index of water is 1.33 . In what direction is the reflected light polarized ? HMSh: (“WW 2 l'33 _———-' M 05.» l “D “50‘ . t k t: A 2&5 g :53.” pfimri‘zfi \M is hm Sw\C&L9_L \ (a. Q10. (3pts) A large blue star has a surface tenperature of 32,000 K. At What wavelength is most of the radiation emitted ? What is the name of this radiation ? ' R: 2rmm'3 E sofa-w we 31,666 KW /\ WWW 4r \LM‘LS ...
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exam 2 Solutions - - EX («M1 343%” Position: (your seat...

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