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A frog can be many different colours. It appears green under normal 'white' light because it absorbs all the other colours in the light's spectrum apart from green. It reflects the green light back and that is picked up by your eye.

If the light is red, there is no green in the spectrum of the light, only red. So, the red light will be absorbed and there is no green to be reflected back for you to see. Therefore, the frog will not look green.
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When the frog is illuminated with a red light, the animal's body absorbs the red wavelengths and reflects no color. Since there is no green light to reflect, its green color can not be shown.

Color by Reflection

Most materials can absorb some colors and reflect others.

The resulting composition of the reflected colors is what is perceived as the color of the body.

This phenomenon is known as color by reflection and depends on the pigments in the object and on the light.

  • PIGMENTS

Pigments are chemical molecules that produce color by the selective absorption of light.

They absorb certain wavelengths and reflect others. The color expressed is due to reflection.

  • LIGHT

The reflected color also depends on the light used to illuminate the object.

White light is a mixture of the visible spectrum of light. Whenever white light meets a pigment, some wavelengths are absorbed by the pigments while others are reflected.

The reflected spectrum is perceived as color and determined to be the color of the object or organism.

→  White object  ⇒  Reflects all colors

→  Black object ⇒   Absorbs all colors

→  Colored object  ⇒  Reflects only its color and absorbs the others.

An object illuminated with a monochromatic light will be seen only when using a light of the same color.

For instance,

→ a red object will express its color only when illuminated with a red light.

→ A blue object illuminated with a green light cannot reflect the green color. It absorbs all colors excepting for blue. A blue object illuminated with a green light will look black.

According to this information,

  • A green frog illuminated with white light will absorb all wavelengths except for the green wavelength, which will be reflected.

  • A green frog illuminated with a green light will reflect the light and express green.

  • A green frog illuminated with red light will absorb the red wavelength and look dark, not red.

So, when the frog is illuminated with a red light, the animal's body absorbs the red wavelengths and reflects no color. Since there is no green light to reflect, its color can not be shown.

You will learn more about color by reflection at

https://brainly.com/question/4204100

https://brainly.com/question/1172560