If polarised light of intensity I passes through a polariser whose axi…

Question

If polarised light of intensity I passes through a polariser whose axis makes angle θ with the polarisation direction, the transmitted intensity by Malus's law is

Accepted Answer

D. {'text': 'I cos²θ', 'label': 'D'}

1. Malus's law relates transmitted intensity of polarised light through a polariser.
2. I_t = I_0 × cos²θ, where θ is the angle between polarisation and analyser axis.
3. For θ = 0, I_t = I_0 (fully transmitted); for θ = 90°, I_t = 0.
4. This is the workhorse formula for photoelasticity and polarisation experiments.
_Source: NCERT Class 12 Physics, Ch 10 "Wave Optics", §10.7_

Answer

{'text': 'I cos θ', 'label': 'A'}

Answer

{'text': 'I × θ', 'label': 'B'}

Answer

{'text': 'I sin θ', 'label': 'C'}