When a red colour paper is seen in the yellow light, it will appear as

CONCEPT

• Reflection: The phenomena in which a light ray is sent back into the same medium from which it is coming, on interaction with boundary, is called reflection.
• Laws of reflection:

• The angle of incidence (θ i ) = Angle of reflection (θ r )
• The incident ray, the reflected ray, and normal to the surface of incidence always lies in the same plane.

EXPLANATION:

• Colour is a property of light that depends on its wavelength.
• When light falls on an object, some of it is absorbed and some is reflected.

• A red object or yellow object looks red or yellow because it reflects the only red colour or yellow colour and absorbs all other colours present in the white light.
• Hence, when the red object is seen through the yellow light then it absorbs yellow colour falling on it and appears dark. Therefore option 4 is correct.

Additional Information

NOTE:

• The colour of a transparent object is determined by the wavelength of the light transmitted by it.
• An opaque object that reflects all wavelengths appears white; one that absorbs all wavelengths appears black.