Sevag K. answered • 02/07/15

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Hi Dalia

Snell's law will help us to solve this question sinθ1⁄sinθ2= n2/n1 = V1/V2

also we will use n = C / V where C is light speed in space 3*10^8 m/s and V is light velocity in material which has refractive index n

sinθ1⁄sinθ2= n2/n1 ---> θ2= sin–¹(sin40 * 1.33/1.5)---> θ2=34.75º

to find speed of light in water V1 = C/n1 ---> V1 = 3*10^8 / 1.33 ----> V1 = 2.2556*10^8 m/s

now we can find speed of light in glass

V1/V2 = n2/n1 ----> V2 = V1 n1/n2 --> V2 = 2.2556*10^8 * 1.33/1.5 ----> V2 = 1.99999*10^8 m/s

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Sevag K.

Hi Dalia like the previous solution till i try to solve this question

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02/09/15

Dalia S.

thank you i did :) i know that sinθcritial= n1/n2, but I'm not getting the right answer

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02/09/15

Sevag K.

u need to study more about sine and cosine properties. u cant get the answer because n1/n2 > 1 ;and there is no sine for number greater than 1.

also study more about light ray traveling from less dense medium to higher dense medium.

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02/09/15

Dalia S.

02/08/15