A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation. If the refractive index of the material of the prism is , then the angle of incidence is :

a. |
30° |
b. |
45° |

c. |
90° |
d. |
60° |

A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation. If the refractive index of the material of the prism is , then the angle of incidence is :

a. |
30° |
b. |
45° |

c. |
90° |
d. |
60° |

1 Answer

127 votes

i = e

r_{1} = r_{2} = = 30°

by Snell's law

1 × sin i = × =

i = 60

127 votes

127