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How is the Refractive Index of a Medium Related to the Speed of Light in It? - Physics

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प्रश्न

How is the refractive index of a medium related to the speed of light in it? 

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उत्तर

Denser medium has a higher refractive index and therefore the speed of light in such medium is lower in comparison to the speed of light in a medium which has a lower refractive index.

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संबंधित प्रश्‍न

Four students P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence 40° and measured the angle of refraction. The values as measured them were 18°; 22°; 25° and 30° respectively. The student who has performed the experiment methodically is

(A) P

(B) Q

(C) R

(D) S


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When a lighted candle is held in front of a thick plane glass mirror, several images can be seen, but the second image is the brightest, give reason.


What do you understand by the statement the refractive index of glass is 1.5 for white light? 


The diagram alongside shows the refraction of a ray of light from air to a liquid.

  1. Write the values of (i) angle of incidence, (ii) angle of refraction.
  2. Use Snell’s law to find the refractive index of liquid with respect to air.


Fig 4.31 below shows a light ray of single colour incident normally on two prisms A and B. In each case draw the path of the ray of light as it enters and emerges out of the prism. Mark the angle wherever necessary. 

 


A postage stamp kept below a rectangular glass block of refractive index 1.5 when viewed from vertically above it, appears to be raised by 7.0 mm. Calculate the thickness of the glass slab.


A ray of light enters a glass slab ABDC as shown in figure and strikes at the centre O of the circular part AC of the slab. The critical angle of glass is 42°. Complete the path of the ray till it emerges out from the slab. Mark the angles in the diagram wherever necessary. 


Make the correct for each of the following : 

With reference to the fig, the refractive index of the glass block is 


How will you verify the laws of refraction or how the refractive index of glass is determined in the laboratory?


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