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COMEDK2012PhysicsWave Optics

Two polaroid A and B are kept with their transmission axes at an angle with respect to one another. If the transmitted intensity of light I_ t =0.75 I₀ , where I₀ is the intensity of light incident on the system, then is

Options

  1. A30^
  2. B45^
  3. C60^
  4. D90^

Correct answer

A. 30^

Step-by-step solution

For two polaroids placed at an axis making angle with each other, then according to law of malus, the intensity of transmitted light is Here, aligned &I_ t =I₀ ² &I_ t =0.75 I₀ aligned 0.75 I₀=I₀ ² ² =0.75= 3 4 = ⁻¹ 3 4 = ⁻¹ ( 3 2 ) =30^

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