Which among the following do you consider the reason for light to be travelling in a staight line?

Options

A. its velocity is very high
B. bending effect is negligible, due to its small wavelength
C. it is not absorbed by atmosphere.
D. it consist of all wave lengths

Answer

### Step-by-Step Solution:

1. **Understanding Light's Behavior**: Light is known to travel in a straight line under normal circumstances. This is a fundamental property of light.

2. **Bending of Light**: Although light typically travels in straight lines, it can bend under certain conditions. This bending of light is referred to as diffraction.

3. **Conditions for Diffraction**: For diffraction to occur, light must encounter an obstacle or a slit that is comparable in size to its wavelength. The wavelength of visible light is very small, typically in the range of nanometers.

4. **Size of Obstacles**: In everyday situations, the obstacles or openings that light encounters are usually much larger than its wavelength. Therefore, diffraction is not commonly observed.

5. **Negligible Diffraction**: Since the wavelength of light is so small, any diffraction that does occur is negligible. This is why we perceive light as traveling in straight lines most of the time.

6. **Conclusion**: The reason light travels in a straight line is primarily due to the negligible bending effect caused by its small wavelength. Thus, the correct answer to the question is that the bending effect is negligible due to the small wavelength of light.