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CBSE Class 12 Physics 2019 Delhi Set 1 Paper

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Question : 4
Total: 27
What is the speed of light in a denser medium of polarising angle 30∘ ?
Solution:  
dµr=tan‌30∘=‌
1
√3
(where dµr, is the refractive index of rarer medium w.r.t. denser medium)
∴µd‌=√3
v‌=‌
c
µ
=‌
3×108
√3
=√3×108m∕ s
[Note : Also accept if a student solves it as follows]
‌µ=tan‌ip
‌µ=tan‌30∘=‌
1
√3

‌∴v=‌
3×108
1
√3
=3√3×108m∕ s
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