Kimberley_P
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Calculate the speed of light in cubic zirconia as a fraction of the speed of light in air. Give your answer to 3 significant figures.
Refractive Index of Cubic Zirconia = 2.16
Refractive Index of air = 1
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golgiapparatus31
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Refractive index = ratio of speed of light in vacuum to speed of light in medium

n = c/v
c = speed of light in vacuum
v = speed of light in medium

so Refractive Index of Cubic Zirconia / Refractive Index of air = speed of light in cubic zirconia / speed of light in air


so 2.16 = 3 x 10^8 / v
v = 1.39 x 10^8 m/s hope this helps
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Kimberley_P
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(Original post by golgiapparatus31)
Refractive index = ratio of speed of light in vacuum to speed of light in medium

n = c/v
c = speed of light in vacuum
v = speed of light in medium

so Refractive Index of Cubic Zirconia / Refractive Index of air = speed of light in cubic zirconia / speed of light in air


so 2.16 = 3 x 10^8 / v
v = 1.39 x 10^8 m/s hope this helps
I typed the answer but its still wrong. and also the answer section has no m/s as a unit
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golgiapparatus31
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(Original post by Kimberley_P)
I typed the answer but its still wrong. and also the answer section has no m/s as a unit
Oh! They are asking the fraction! It is simply the ratio of refractive index!

So Refractive Index of Cubic Zirconia / Refractive Index of air = speed of light in cubic zirconia / speed of light in air = 1/2.16 = 0.463 no units!
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Kimberley_P
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(Original post by golgiapparatus31)
Oh! They are asking the fraction! It is simply the ratio of refractive index!

So Refractive Index of Cubic Zirconia / Refractive Index of air = speed of light in cubic zirconia / speed of light in air = 1/2.16 = 0.463 no units!
Thank you
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Kimberley_P
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how would you do this question?
Crown Glass - 1.51
air =1
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golgiapparatus31
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(Original post by Kimberley_P)
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how would you do this question?
Crown Glass - 1.51
air =1
1.51 sin c = 1 sin 90
sin c = 1/1.51
c = 41.5

critical angle is 41.5, there is no refraction
so 0
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Kimberley_P
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when i put zero its tells me
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so I am not sure
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golgiapparatus31
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(Original post by Kimberley_P)
when i put zero its tells me
Name:  d8.5.png
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so I am not sure
there is reflection
so angle is 50
try 50
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Joinedup
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assuming it's this page https://isaacphysics.org/questions/ch_d_p8

the instructions tell you to enter 99 with 'none' as units if refraction is impossible
always read the instructions carefully
Last edited by Joinedup; 2 years ago
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golgiapparatus31
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(Original post by Joinedup)
assuming it's this page https://isaacphysics.org/questions/ch_d_p8

the instructions tell you to enter 99 with 'none' as units if refraction is impossible
always read the instructions carefully
saviour!
tysm
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Kimberley_P
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(Original post by Joinedup)
assuming it's this page https://isaacphysics.org/questions/ch_d_p8

the instructions tell you to enter 99 with 'none' as units if refraction is impossible
always read the instructions carefully
thank you
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