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AP EAMCET202017 Sep 2020Evening ShiftPhysicsRay OpticsActual

A ray of light travels from a medium of refractive index 2 to another medium of refractive index ( 2 ). Total internal reflection takes place when the angle of incidence is

Options

  1. A(30^ )
  2. B(45^ )
  3. C(60^ )
  4. D(80^ )

Correct answer

B. (45^ )

Step-by-step solution

Refractive index of first medium, ( ₁=2 ) Refractive index of second medium, ( ₂= 2 ) If (i_C ) be the angle of incidence in the case of total internal reflection, then ( array ll & ^2 ₁= 1 i_C ₁ ₂ = 1 i_C & 2 2 = 1 i_C 2 = 1 i_C & i_C= 1 2 i_C= 45^ & i_C=45^ array )

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