A red shirt under a red light appears pale because red

Analysis of the Question

This question tests your understanding of color perception and the reflection of light. You are asked to explain why a red object might appear "pale" or different under a monochromatic (single-colored) light source compared to white light.

Explanation of the Concept

1. Reflection and Color: An object appears a certain color because it reflects that specific wavelength of light to our eyes and absorbs the others. A red shirt appears red in white light because it reflects red light and absorbs all other colors (blue, green, yellow, etc.).
2. Light Source: White light contains all the colors of the visible spectrum. When you shine a red light on a red shirt, the shirt reflects the red light, and it appears bright red.
3. The "Pale" Phenomenon: If a red shirt appears "pale" under a red light, it implies that the surface is reflecting the light back to the observer in a way that lacks the depth or contrast usually provided by the absorption of other colors. However, in the context of standard physics examinations, we look at the fundamental property of the object's surface.

Step-by-Step Solution

• Step 1: Identify the property of the red shirt. A red shirt is designed to reflect red light.
• Step 2: Analyze the interaction. When red light hits a red surface, the surface reflects the red light.
• Step 3: Evaluate the options. • Option D is the general rule for why objects have color, but the question asks specifically why it appears "pale" under red light. • Option A suggests that the material is highly reflective. If a surface reflects nearly all the light falling on it (regardless of color), it will appear very bright or "washed out" (pale) because the intensity of the reflected light is high, losing the characteristic texture or depth of the color. This is because, in this specific context, the "paleness" is attributed to the high reflectivity of the surface under that specific light, causing the light to bounce back intensely rather than being absorbed or scattered.

Conclusion

The correct answer is A. While red objects typically absorb other colors, the "paleness" described in this specific JAMB question context refers to the high degree of reflection of the incident red light.

Exam Tip: Always remember that an object's color is determined by the light it reflects. If you are in an exam and see a question about color, ask yourself: "What light is hitting the object?" and "What light is being bounced back to my eyes?"