An object looks green in white light. Now the white light is passed through a clear blue plastic on the same object. What colour will the object appear to be?

Options

A. Green
B. Magenta
C. Black
D. Red

Explanation

To solve the question, let's break it down step by step:

### Step 1: Understanding the Color of the Object in White Light
- The object appears green in white light. White light is made up of all colors of the spectrum (red, orange, yellow, green, blue, indigo, violet).
- Since the object appears green, it reflects green light and absorbs all other colors.

### Step 2: Introducing the Blue Plastic
- Now, we pass white light through a clear blue plastic. This blue plastic will filter the light.
- Only blue light will pass through the blue plastic; all other colors (including green) will be absorbed by the plastic.

### Step 3: Analyzing the Interaction of Blue Light with the Green Object
- When the blue light reaches the green object, we need to consider how the object reacts to this light.
- The green object reflects green light and absorbs other colors. Since the blue light is the only light available after passing through the blue plastic, the green object will absorb this blue light.

### Step 4: Determining the Color Appearance
- Since the green object absorbs the blue light and does not reflect any light (as it only reflects green), it will not reflect any light at all.
- The absence of reflected light makes the object appear black.

### Conclusion
- Therefore, when white light is passed through a clear blue plastic onto the green object, the object will appear black.

### Final Answer
The object will appear black.

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