Which of the following statements is NOT true?
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A.
At critical angle incident angle is 90°
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B.
Incidence angle must be greater than critical angle
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C.
In total internal reflection no transmission of light take place
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D.
For total internal reflection light ray must travel from denser medium to rarer medium
Correct Answer:
A. At critical angle incident angle is 90°
Explanation:
The statement that the incident angle is 90 degrees at the critical angle is incorrect. The critical angle is defined as the specific angle of incidence that results in an angle of refraction of exactly 90 degrees. For total internal reflection to occur, two conditions must be met: light must travel from an optically denser medium to a rarer medium, and the angle of incidence must exceed this critical angle. When these conditions are satisfied, no light is transmitted through the boundary; instead, the entire ray is reflected back into the original denser medium. Therefore, while the refraction angle is 90 degrees at the critical point, the incident angle itself is a smaller, specific value determined by the refractive indices of the two materials.
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