Which one of the following colours may be obtained by combining green and red colours?
Yellow
Understanding Color Mixing: Red and Green
When we talk about mixing colors, it's important to distinguish between additive color mixing and subtractive color mixing. Additive color mixing is what happens when you mix light, like on a TV screen or computer monitor. Subtractive color mixing is what happens when you mix pigments, like paints or inks.
The question asks about combining colors, and the options suggest we are likely dealing with additive color mixing, as mixing red and green light results in a different outcome than mixing red and green paint.
Additive Color Mixing Basics
In additive color mixing, the primary colors are Red, Green, and Blue (RGB). When these primary colors of light are combined in different proportions, they create other colors. Combining all three primary colors of light results in white light.
The secondary colors in additive mixing are formed by combining two primary colors:
- Red + Green = Yellow
- Red + Blue = Magenta
- Green + Blue = Cyan
Combining Green and Red Colours (Additive Mixing)
Based on the principles of additive color mixing, when green light is combined with red light, the resulting color is yellow.
Let's look at the options provided in the context of additive color mixing:
- Blue: This is a primary additive color, not a result of mixing red and green.
- Magenta: This color is obtained by mixing red and blue light.
- Pink: Pink is typically a lighter shade of red or magenta, often associated with subtractive mixing or specific contexts, but not a standard result of mixing primary red and green light.
- Yellow: This color is the result of combining red and green light.
Therefore, combining green and red colours, in the context of light (additive mixing), produces yellow.
| Primary Color 1 (Light) | Primary Color 2 (Light) | Resulting Color (Light) |
|---|---|---|
| Red | Green | Yellow |
| Red | Blue | Magenta |
| Green | Blue | Cyan |
| Red | Green | \text{Yellow} |
Revision Table: Key Color Mixing Concepts
| Concept | Primary Colors | Secondary Colors | Mixing All Primaries | Example |
|---|---|---|---|---|
| Additive (Light) | Red, Green, Blue | Yellow, Magenta, Cyan | White | TV screen, stage lighting |
| Subtractive (Pigment) | Red, Yellow, Blue (Traditional) or Cyan, Magenta, Yellow (Printing) | Orange, Green, Violet (Traditional) or Red, Green, Blue (Printing) | Black (Ideally) | Paint, ink, filters |
Additional Information: Understanding Color
Color is our perception of different wavelengths of light. When light hits an object, some wavelengths are absorbed, and others are reflected. We see the color of the wavelengths that are reflected.
In additive mixing, we are combining sources of light, adding their wavelengths together. In subtractive mixing, pigments absorb certain wavelengths of light, and the color we see is the light that is left over after some wavelengths have been subtracted by the pigments.
The question specifically mentions combining green and red colours, and given the options, it clearly refers to the additive mixing of light where red light plus green light equals yellow light.
Important Questions from Optics
Which of the following are the primary colours of light?
Directions: The following items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below:
Statement I: Diamond is very bright.
Statement II: Diamond has very low refractive index
A non-SI unit called 'nit' is the unit of which of the following photometric quantities used to measure a multitude of light intensity?
Which among the following is used as a reflector in search lights?
The incident ray, the ray perpendicular to the point of incidence, and the reflected ray all lie________.
