9. A ray of light is incident on a glass sphere of refractive index 3/2. What sh

Question

9. A ray of light is incident on a glass sphere of refractive index 3/2. What should be the angle of incidence so that the ray which enters the sphere doesn't come out of the sphere? (a) tan-1(3) (c) sin-1(1) 10. A beam of light consisting of red, green and blue colors is incident on a right angled prism. The refractive indices of the material of the prism for the above red, green and blue wavelength are 1.39, 1.44 and 1.47 respectively. The prisnm will: (b) sin-l (j) (d) cos-(3) 45 (a) Separate part of red color from the green and the blue colors (b) Separate part of the blue color from the red and green colors (e) Separate all the colors from one another (d) Not separate even partially any color from the other two colors

Explanation / Answer

1.

Sin i= 1/u

i= sin-1( 2/3)

Option (b) is correct.

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2.

Refractive index of prism

u= 1/sin45= sqrt(2)= 1.414

ur< u

Hence it will seperate only red colour from other two lights.

Option (a ) is correct.

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Do comment in case any doubt..goodluck

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