The invisible spectrum beyond red of visible spectrum is called ................ spectrum.

Options

A. Green
B. Infrared
C. Ultraviolet
D. Yellow

Explanation

To solve the question "The invisible spectrum beyond red of the visible spectrum is called ................ spectrum," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Visible Spectrum**:
The visible spectrum consists of light that can be seen by the human eye, which includes the colors red, orange, yellow, green, blue, indigo, and violet.

2. **Identify the End of the Visible Spectrum**:
The visible spectrum ends with the color red. Beyond red, there are other types of electromagnetic radiation that are not visible to the human eye.

3. **Know the Types of Electromagnetic Radiation**:
The electromagnetic spectrum includes various types of radiation, starting from gamma rays and going all the way to radio waves. The order includes ultraviolet rays, visible light, and then infrared rays.

4. **Locate the Invisible Spectrum Beyond Red**:
After red in the visible spectrum, the next type of radiation is infrared. Infrared radiation is not visible to the human eye but is present just beyond the red end of the visible spectrum.

5. **Select the Correct Answer**:
Based on the information above, the invisible spectrum beyond red is called the infrared spectrum. Therefore, the correct answer is "infrared."

### Final Answer:
The invisible spectrum beyond red of the visible spectrum is called **infrared spectrum**.

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