1.When light leaves air and enters water, it? the normal line. a.Gets perpendicu

Question

1.When light leaves air and enters water, it? the normal line.

a.Gets perpendicular to

b.gets parallel to

c.bends away from

d.bends toward

2.An object is located 30cm from a converging lens. The focal length of the lens is 20cm. What is the distance between the image formed and the lens?

3.When you plot 1/Do as a function of 1/Di for a converging lens, the Y-intercept of the best fit line turns out to be 0.042(cm-1) . What is the focal length of the converging lens? I think the answer is 23.8

4.Speed of light in a transparent medium is 2.5x108m/s. What is the index of refraction for this medium?

c=3x108m/s I think the answer is .83

Explanation / Answer

1) bends towars the normal when light enters from air to water

2) 1/f = 1/do + 1/di

1/20 = 1/30 + 1/di

di = 60 cm

3) 1/do is a function od i/di

1/do is on Y axis

so Y intercept = 1/do = 0.042

as the above value is Y intercept that means the vlaue of i/di at that point is zero

1/f = 1/do + 1/di

1/f = 0.042 +0

f = 23.8 cm

4) frequency remains same

speed inversly propotional to refractive index

spreed of light in air = 3x10^8 m/s

n1/n2 = v2/v1

n1/1 = 3x10^8/2.5x10^8

n1 = 1.2

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