Which one of the following colours is not a part of the rainbow?
Grey
Understanding Rainbow Colors and Light Dispersion
A rainbow is a meteorological phenomenon that is caused by reflection, refraction, and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc.
The colours that make up the visible spectrum of light, which we see in a rainbow, are traditionally listed in a specific order. This order is often remembered using the acronym VIBGYOR.
Identifying the Colors of the Rainbow (VIBGYOR)
The acronym VIBGYOR stands for the following colors:
- Violet
- Indigo
- Blue
- Green
- Yellow
- Orange
- Red
These are the seven principal colors that are typically associated with a rainbow.
Analyzing the Given Options
Now let's examine the colors provided in the options and compare them to the known colors of the rainbow:
| Option Color | Is it in the Rainbow (VIBGYOR)? |
|---|---|
| Violet | Yes (V) |
| Grey | No |
| Orange | Yes (O) |
| Red | Yes (R) |
Based on the comparison, we can see that Violet, Orange, and Red are all part of the VIBGYOR spectrum found in a rainbow.
Conclusion: Which Color is Not in a Rainbow?
The color Grey is not listed among the traditional colors of the rainbow (Violet, Indigo, Blue, Green, Yellow, Orange, Red).
Therefore, out of the given options, Grey is the color that is not a part of the rainbow.
Revision Table: Key Concepts about Rainbows
| Concept | Description |
|---|---|
| What is a rainbow? | A spectrum of light caused by sunlight shining on water droplets. |
| How does it form? | Sunlight is refracted (bent) as it enters a raindrop, reflected off the back of the raindrop, and then refracted again as it leaves. This process separates white light into its component colors. |
| Rainbow Colors (VIBGYOR) | Violet, Indigo, Blue, Green, Yellow, Orange, Red. |
| Why are there different colors? | Each color of light has a slightly different wavelength and bends at a different angle when passing through water, causing the separation. |
Additional Information: More on Light and Color
While VIBGYOR lists the main colors, the spectrum is continuous, meaning there are many shades and variations between these main colors. However, colors like brown, pink, black, and grey are not seen in a typical rainbow created by the dispersion of sunlight.
The appearance and intensity of a rainbow can depend on the size and number of water droplets, the position of the sun and the observer.
Understanding the dispersion of light is a fundamental concept in optics, explaining how prisms also separate white light into its constituent colors, similar to how raindrops do.
Important Questions from Climatology
Consider the following statements about anticyclones :
1. Anticyclones are high pressure systems.
2. Air in the centre of the system must be subsiding.
3. Anticyclones are characterized by converging winds.
How many of the above statements is/are correct?
- Snow, sleet and hail are the forms of
- Nisarga, Gati, Nivar, Tauktae and Yaas are names of
Which one of the following is the correct sequence of layers as we move from the Earth’s surface upwards?
Which one of the following is a cold local wind?
