Yes, DNA is smaller than the wavelengths of visible light.
Understanding the Size of DNA and Light
To understand why DNA is smaller than light, consider their respective sizes:
- DNA Width: The double helix of DNA is approximately 0.01 micrometers (or 10 nanometers) in width.
- Wavelength of Visible Light: Visible light ranges in wavelength from about 400 nanometers (violet) to 700 nanometers (red).
Since 10 nanometers (DNA width) is considerably smaller than 400-700 nanometers (wavelength of visible light), DNA is indeed smaller than the wavelengths of visible light.
Implications of DNA's Size
Because DNA is smaller than the wavelength of visible light, it cannot be directly observed using a standard light microscope. The resolution of a light microscope is limited by the wavelength of light used; objects smaller than this wavelength cannot be resolved. This is why techniques like electron microscopy, which uses electrons with much smaller wavelengths, are required to visualize DNA directly.
Summary
DNA is significantly smaller than the wavelengths of visible light, making it impossible to view directly with a standard light microscope.
