Final answer:
A lemon might reflect wavelengths in the yellow region of the spectrum because those are the wavelengths it does not absorb, making it appear yellow. Objects appear the color of the light they reflect, not the color they absorb. The color seen is the color reflected.
Step-by-step explanation:
The lemon might reflect only wavelengths in the yellow region of the spectrum. The color of an object is determined by the wavelengths of light it reflects.
When white light (which contains all colors of light) strikes an object, some wavelengths are absorbed by the object, and others are reflected back. The reflected wavelengths reach our eyes and are interpreted as color.
Lemons appear yellow because they absorb all colors except for yellow, which is reflected. This concept is explained in the color wheel, where complementary colors are diametrically opposite each other. Any light that is not absorbed is reflected to create the color we perceive.
In the case of a lemon, wavelengths in the yellow region of the spectrum are reflected, thus making the lemon appear yellow to our eyes.
Learn more about Reflection of Light