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CBSE Class 10 Answered

Under what condition, the angle of refraction will be equal to the angle of incidence? Refractive  index  of glass is 1.65, what  is the  speed of light in glass?
Asked by jatin452002 | 08 Jun, 2017, 05:33: PM
answered-by-expert Expert Answer
The condition the angle of refraction will be equal to the angle of incidence:
1. If the refractive index of both the media is same.
2. If the incident ray falls normally to the surface of the second medium than the incident angle is equal to the refracted angle. In this, there is no refraction of light as there is no change in the direction of the light.
 
begin mathsize 12px style We space know space that Refractive space index space of space glass space equals space fraction numerator Speed space of space light space in space vacuum over denominator Speed space of space light space in space glass end fraction therefore Speed space of space light space in space glass space equals space fraction numerator Speed space of space light space in space vacuum over denominator Refractive space index space of space glass end fraction rightwards arrow Speed space of space light space in space glass space equals space fraction numerator 3 space cross times space 10 to the power of 8 space straight m divided by straight s over denominator 1.6 end fraction space equals space 1.8 space cross times space 10 to the power of 8 space straight m divided by straight s therefore Speed space of space light space in space glass space equals space 1.8 space cross times space 10 to the power of 8 space straight m divided by straight s end style
Answered by Yashvanti Jain | 08 Jun, 2017, 06:39: PM

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