Assertion : Optical fibres are used for telecommunication.
Reason : Optical fibres are based on the phenomenon of total internal reflection.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct and but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct and but Reason is not the correct explanation for Assertion.
Optical fibres are used for telecommunication, and it is based on the phenomenon of total internal reflection. However, the given reason is not the correct explanation.

Optical fibres are used for telecommunication because signals travel through them with lesser power loss, making it more efficient.

Hence, both assertion and reason are correct and but reason is not the correct explanation for Assertion.

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