F) 6.0 cm. 6. diven the refractive index of sodium chloride 1.53, the speed of l

Question

F) 6.0 cm. 6. diven the refractive index of sodium chloride 1.53, the speed of light in this material is: A) 4.57 X 108 m/s B) 4.43 X 10 m/s C) 2.02 X 108 m/s D) 1.95 X 103 m/s E) zero m/s (light does not travel in sodium chloride-TABEL SALT) 7. In a projector, the slid acts as an object whose image is projected on a screen. If a 120.0 mm focal-length lens is to project an image on a screen 8.0 m away, how far from the lens should the slide be? A) 8.46 m B) 8.21 m C) 0.122 m D) 0.200 m E) 0.118 m J NAEINI, PHY1322, Test 5, Spring2018

Explanation / Answer

6)(D)1.95 x 10^8 m/s

explanation

from the dfination of refractive index

n = c/v => v = c/n

v = 2.99 x 10^8/1.53 = 1.95 x 10^8 m/s

Hence, (D)1.95 x 10^8 m/s

7)(C)0.122m

explanation:

from lens eqn

1/f = 1/i + 1/o

o = i x f/(i - f) = 8 x 0.12/(8 - 0.12) = 0.122 m

Hence, (C)0.122 m

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