NEET
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- NEET
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- Physics
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- Wave Optics
NEET · Physics · Wave Optics
Given below are two statements: one is labelled as Assertion (A)...
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): When unpolarised light is incident on a transparent surface at Brewster's angle, the reflected ray and the refracted ray are mutually perpendicular.
Reason (R): At Brewster's angle, the electric field vectors of the completely polarised reflected light vibrate parallel to the plane of incidence.
In the light of the above statements, choose the most appropriate answer from the options given below:
Assertion (A): When unpolarised light is incident on a transparent surface at Brewster's angle, the reflected ray and the refracted ray are mutually perpendicular.
Reason (R): At Brewster's angle, the electric field vectors of the completely polarised reflected light vibrate parallel to the plane of incidence.
In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
C. (A) is correct but (R) is not correct
Step-by-step solution
According to Brewster's law, when unpolarised light is incident at the polarising angle (Brewster's angle), the reflected and refracted rays are perpendicular to each other. Thus, Assertion (A) is correct.
The reflected light is completely plane-polarised, and its electric field vectors vibrate perpendicular to the plane of incidence, not parallel to it. Thus, Reason (R) is incorrect.
Answer: (A) is correct but (R) is not correct
The reflected light is completely plane-polarised, and its electric field vectors vibrate perpendicular to the plane of incidence, not parallel to it. Thus, Reason (R) is incorrect.
Answer: (A) is correct but (R) is not correct