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# Lect25 - &" \$ A ray of light passes from air into...

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Unformatted text preview: % & ! " # \$ A ray of light passes from air into water with an angle of incidence of 30 degrees. * + Which of the following quantities does not change as the light enters the water? A. wavelength B. frequency C. speed of propagation ( " " ," " " - ))) ' ! . ! / D sin 2 c / n2 D sin 1 c / n1 n2 sin 2 n1 sin 1 + ( 3 " " + ) 1 " 2 + 1 0 A x1 l1 y1 + 8 8 y2 x2 l2 B 5 6 7 t l1 v1 l2 v2 2 2 x1 y1 v1 2 2 x2 y2 v2 % 9 7 7) dt dx1 x2 x2 v2 l 2 x1 2 v1 x1 x2 y12 2 v2 x2 dx2 2 y2 dx1 D x1 0 dx2 dx1 sin 1 v1 1 sin 2 v2 7 % x1 v1l1 v = c/n n1 sin 1 n2 sin 2 4 / from n1 to n2 from n1 to n2 : The path of light is bent as it passes from medium 1 to medium 2. * + Compare the indices of refraction in the two media. B. n1 = n2 A. n1 > n2 C. n1 < n2 / ; < ! 2, = > 2 > 1 6? 2 7 ;% 8 8 1 > c < ! % A light ray travels in a medium with n1 and completely reflects from the surface of a medium n2. * + " The critical angle depends on: B. n2 only A. n1 only C. both n1 and n2 " < 5 A + + @ < @ B 56.3o 1 2 90 2 sin 2 1 sin( 90 1 1) cos 1 / n2 sin n2 cos n1 sin tan 1 n2 n1 ' A ray of light passes from air into water with an angle of incidence of 30 degrees. * + " Some of the light also reflects off the surface of the water. If the incident light is initially unpolarized, the reflected light will be A. unpolarized B. somewhat horizontally polarized C. somewhat vertically polarized o = horizontal . 5 " 2 " @ " #2 " [email protected] 5 " 2 " " " #2 @ [email protected] < ( 5\$ C 6\$ *\$ D " " " " " " ) " / @ ?? A w water / " 0 * A light is shining at the bottom of a swimming pool (shown in yellow in the figure). A person is standing at the edge of the pool. + ' Can the person standing on the edge of the pool be prevented from seeing the light by total internal reflection at the water-air surface? A. yes B. no " " @ @ E !5 ( , C = !5 F 4 =7 G E / ! 97 air 90 sin water na sin90 nw na nw 1 1.33 water 48.5 : HE )( ) 7 A )I HJ + " " = I ; =7 5 F . + ( ) + + + + [email protected] " " % @ 45o @'' % % % .% 0% :% %% K KE 7 " [email protected] % =7 5 F . + ( ) < ! 45o + + + + " % [email protected] " % % .% 0% @ @'' % :% %% + ? B) R . =' @ C) = ':@4 A) R = :@' / R #. \$ # !\$ R # !\$ #. \$ = K %@ ' ' @ #%@ ' \$ =7 5 F . + ( ) ( " " + + + + [email protected] " " % @ 45o @'' R % % % .% 0% R :% %% ' @ ) 5 \$ ' @. 6 \$ '[email protected] # !\$ % * \$ [email protected] #' @ \$ 7 % ' @. L 5 F . + + + K? " + + [email protected] % @ 45o % @'' % % .% 0% :% %% < #( 5\$ + ' @. 6 \$ ' @. \$ * \$ ' @% " E \$ .%@4 = \$ [email protected] ) ' 45o 45o @'' R % ' @. % R % % :% %% % % .% 0% :% %% % .% 0% ' @ 45o % R @'' .%@4 .% \$ % % M #' @. 0% :% %% . C 5 " b @ " , @ 6, ,C b #5 \$ " " " #% " & > ' ' @ #6 \$ #*\$ & " " & ;% \$ / n1 sin 1 n2 sin 2 H I ! 7 8 8 L 5 # \$ K? 7 @ # '[email protected] ( " ) #5 \$ ' n3 n1 #6 \$ n1 n3 n2 #* \$ n3 n2 < n1 = n3 ' ( ' ' & 0 ...
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