Two multiple choice questions that are giving me trouble on mystudy guide. I wil

Question

Two multiple choice questions that are giving me trouble on mystudy guide. I will rate whoever can gho through thesequestions as a lifesaver!! I am finishing up a study guideand this would really help!

1. The speed of light in a certain medium is 2.2 x108 m/s. What is the index of refraction of thismedium?

A) 1.6
B) 1.0
C) 1.8
D) 1.2
E) 1.4



2. A small object is located 13.0 cm in front of a concavemirror with a radius of curvature of 32.0cm. Where will theimage be formed? (enter a negative value if the image formsbehind the mirror).

A) +68.2 cm
B) -45.3 cm
C) -87.8 cm
D) -69.3 cm

Explanation / Answer

Speed of light in a medium v = 2.2* 10 ^ 8 m / s

Index of refraction of medium n = c / v

Where c = speed of light in vacuum = 3* 10^ 8 m / s

Plug the values we get n = 1.3636

(b).

Distance of the object u = 13 cm

From the relation ( 1/ u ) + ( 1/ v ) = ( 1/ f)

( 1/ v) = ( 1/ f) – ( 1/ u )

           =-0.0144

        v = - 69.33 cm

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