Question

19.
13. A small air bubble is inside a glass cube of side
15 cm. When seeing from the top face, the bubble
appears at a distance of 5 cm and if seen from the
opposite face it appears at 7 cm. Refractive index
of glass is
​

Answer 1

Refractive index of the glass is 1.25

Explanation:

Real depth / apparent depth = refractive index

   h1 / 5 cm = μ    =>  h1 = 5 μ  cm

  h2 / 7 cm =  μ    =>  h2 = 7 μ  cm

   h1 + h2 =  15 cm = 12 μ    =>    μ = 1.25 cm

• The bubble is in the quarter half of the width of the cube.  

• So real depth from h1 one side face is equal to (15 - h1) of the real depth from the opposite face.

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The refractive index of glass with respect to medium is 4/3 if the difference in the velocity of light vm-vg=6.25*10^7 m/s then the velocity of light in the medium will be ?

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