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When light is polarised by reflection fr...

When light is polarised by reflection from a transparent surface.
a) reflection and refracted rays are mutually perpendicular
b) both reflected and refracted rays are plane polarised
c) refraction ray is partially polarised
d) the R.I., of transparent surface is equal to tangent of Brewster.s angle

A

only a and c are true

B

only b, c and d are true

C

only a, c and d are true

D

only a and d are true

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the polarization of light by reflection from a transparent surface, we will analyze each of the given statements one by one. ### Step-by-Step Solution: 1. **Understanding Polarization by Reflection**: - When light strikes a transparent surface, part of it is reflected and part is refracted. The reflected light can become polarized depending on the angle of incidence. 2. **Analyzing Statement A**: - **Statement A**: "Reflection and refracted rays are mutually perpendicular." - According to the laws of reflection and refraction, at Brewster's angle (the angle at which light is perfectly polarized upon reflection), the angle between the reflected ray and the refracted ray is indeed 90 degrees. Thus, this statement is **true**. 3. **Analyzing Statement B**: - **Statement B**: "Both reflected and refracted rays are plane polarized." - The reflected ray is plane polarized, but the refracted ray is only partially polarized. Therefore, this statement is **false**. 4. **Analyzing Statement C**: - **Statement C**: "Reflected ray is partially polarized." - The reflected ray at Brewster's angle is fully polarized, not partially. Hence, this statement is **false**. 5. **Analyzing Statement D**: - **Statement D**: "The R.I. of transparent surface is equal to tangent of Brewster's angle." - According to Brewster's law, the refractive index (R.I.) of the transparent surface is indeed equal to the tangent of Brewster's angle. This statement is **true**. 6. **Conclusion**: - From the analysis, we find that statements A and D are true, while statements B and C are false. ### Final Answer: - The correct options are **A** and **D**.
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