Assertion :In the electromagnetic spectrum, the small portion around $10^{15} H z$ is called visible light. Reason: Visible region is only a small part of the entire spectrum which our eyes can see.

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

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Both Assertion and Reason are correct 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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The Visible region of electromagnetic spectrum varies from $380$ nm to $760$ nm i.e. $7 \times 10^{14} H z t o 4 \times 10^{14} H z$
This is the only region which is visible to human eyes. That's why it is termed as the Visible region.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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