The danger signals are red while eye is more sensitive to yellow because:
Correct answer: C. Red light is longer in wavelength than yellow
- A. Scattering in red is less than in yellow
- B. Scattering in yellow is less than that of red
- C. Red light is longer in wavelength than yellow
- D. None of these
Explanation
Red light has the longest wavelength among visible colours, which means it scatters the least when travelling through air particles. This allows red light to travel further distances and remain visible from afar, making it ideal for danger signals. While the human eye is more sensitive to yellow light, the longer wavelength of red light makes it more visible in low-light conditions and under various weather circumstances.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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