Which property of light is used in optical fibers?

Last Updated: 25 Jun 2026

Here, the relevant answer is “Total internal reflection.” A sound solution relies on the governing concept rather than a memorised option letter, because option order may change in another paper. The distractors in this question—Dispersion, Polarization, Diffraction—do not satisfy the exact condition stated. The final selection must agree with the explanation and marked answer: Total internal reflection.

ADispersion

BPolarization

CTotal internal reflection

DDiffraction

Correct Answer: Total internal reflectionYour Answer: C

Explanation

— the scientifically appropriate response is Total internal reflection. Option-wise review: Total internal reflection is correct under the condition given in the stem. Dispersion is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Polarization is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Diffraction is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option C, Total internal reflection, is factually and logically consistent with the question. Optical fibers use total internal reflection to transmit light signals over long distances.

Important Notes

Read the complete stem before looking at the options. Identify whether the demand is a definition, unit, formula, direction, cause, effect, image characteristic, or device principle. In this record, the confirmed answer is Total internal reflection.
Do not interchange closely related terms: mass and weight; distance and displacement; speed and velocity; heat and temperature; reflection and refraction; real and virtual image; current and potential difference; power and energy. Such pairs generate common SSC distractors.
Eliminate Dispersion, Polarization, Diffraction here because none fulfils the exact requirement of the stem. The final answer and correct-index field must point to option C.
Exam memory point: connect Total internal reflection directly with the key wording of the question, then verify it once against the relevant definition or formula before marking the answer.Requires angle critical angle

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FAQ

SSC CGL Physics FAQs

Common questions and clear answers for this topic.

How many physics questions usually appear in the SSC CGL exam?

Physics typically makes up a small portion of the General Science questions, usually focused on concepts rather than numerical problems.

Which physics topics are most important for SSC CGL?

Basic mechanics, heat, sound and light, and electricity and magnetism are the areas that come up most consistently across previous papers.

Do I need to solve numerical problems for SSC CGL physics?

Rarely. Most questions are conceptual and test everyday understanding rather than calculation skills.

Is NCERT physics enough for SSC CGL preparation?

NCERT textbooks from classes 9 and 10 build a strong enough conceptual base for most of what SSC CGL asks.

How can I make physics concepts easier to remember for SSC CGL?

Connecting concepts to everyday observations, like why a thermos keeps tea warm, makes them far easier to recall than memorizing definitions.

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