Question
Which of the following wavelength (nm) correspond to visible range of humans ?
A. 20 nm
B. 200 nm
C. 400 nm
D. 600 nm
E. 900 nm
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
C and D Only
Visible Wavelengths for Human Sight
The visible light spectrum represents the portion of the electromagnetic spectrum that is visible to the human eye. This range typically spans from approximately 380 nanometers (nm) to 750 nm.
Wavelength Analysis
Let's analyze the given wavelength options:
- Option A (20 nm): This wavelength falls within the ultraviolet (UV) range, which is shorter than visible light.
- Option B (200 nm): This wavelength is also in the ultraviolet (UV) range, far below the visible spectrum.
- Option C (400 nm): This wavelength is at the violet end of the visible light spectrum. It is within the human visible range.
- Option D (600 nm): This wavelength falls within the visible light spectrum, corresponding to colors like orange and yellow. It is within the human visible range.
- Option E (900 nm): This wavelength is in the near-infrared (IR) range, which is longer than visible light and not perceived by the human eye.
Conclusion on Visible Range
Based on the standard definition of the visible light spectrum (approximately 380 nm to 750 nm):
- Wavelengths 400 nm (Option C) and 600 nm (Option D) fall within the human visible range.
- Wavelengths 20 nm, 200 nm, and 900 nm fall outside this range.
Therefore, the wavelengths corresponding to the visible range for humans from the options provided are 400 nm and 600 nm.
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