Question

a lens focuses light at a single point called the focal point.
what is responsible for the light rays coming together at the focal point?
○ absorption
○ diffraction
○ reflection
○ refraction

Explanation:

When light passes through a lens, it bends (refracts) due to the change in medium (from air to lens material and back to air). This bending of light (refraction) causes the parallel light rays to converge at the focal point. Absorption is when light is taken in by a material and not transmitted. Diffraction is the bending of light around obstacles. Reflection is the bouncing back of light from a surface. Since the light is passing through the lens (not bouncing off - so not reflection), not being spread around obstacles (not diffraction), and not being absorbed (as it reaches the focal point), refraction is the correct answer.

Answer:

refraction