Laser is/ are

Options

A. Highly coherent
B. Highly monochromatic
C. Highly directional
D. All of these

Answer

To answer the question "Laser is/are," we need to analyze the properties and characteristics of lasers based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Understanding the Definition of Laser**:
- The term "laser" stands for "Light Amplification by Stimulated Emission of Radiation." This definition is crucial in understanding what a laser is.

2. **Identifying Key Properties of Lasers**:
- Lasers have several distinct properties that set them apart from other light sources. The five main properties mentioned are:
- **Monochromatic**: Lasers emit light of a single wavelength. This means that all the light waves produced by a laser are of the same color.
- **Coherent**: The light waves emitted by a laser are in phase with each other, which means they have a consistent phase relationship.
- **Polarized**: Laser light is typically polarized, meaning the light waves oscillate in a single plane.
- **Collimated**: Laser beams are highly directional, meaning they travel in parallel lines and spread very little over distance.
- **High Energy**: Lasers can produce light with very high intensity, measured in watts or joules per second.

3. **Analyzing the Options**:
- Based on the properties listed, we can conclude that lasers exhibit all the mentioned characteristics. Therefore, if the options provided in the question include statements about lasers being monochromatic, coherent, polarized, collimated, and having high energy, we can infer that all options are correct.

4. **Conclusion**:
- Since all the properties of lasers are true, we can confidently say that the answer to the question "Laser is/are" is that all options are correct.

### Final Answer:
All options are correct regarding the properties of lasers.

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