50% of light will be transmitted by two ideal Polaroids oriented with their axes parallel to each other.
To find the answer, we need to know about the malus law.
What's Malus law?
- According to Malus law, the intensity of light passed through a polaroid is the intensity of light incident on it times the square of the cosine of the angle between the pass axis of the polaroid and the direction of polarization of the incident light.
- Mathematically, I=I₀× cos²Ф
What will be the intensity of light transmitted by two ideal Polaroids oriented with their axes parallel to each other?
- The direction of polarization of light passed through the first polaroid remains along the pass axis of it.
- When the light coming from the first polaroid enters the second polaroid, its direction of polarization remains parallel with the pass axis of second polaroid. So the angle is 0°.
- The intensity of the light now remains the same as that of enters into the first polaroid.
Thus, we can conclude that 50% of light will be transmitted by two ideal Polaroids oriented with their axes parallel to each other.
Learn more about the Malus law here:
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