WVGSA Grade 8 Science Practice Questions - West Virginia General Summative Assessment Grade 8 Science Exam

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When a straight straw is placed into a clear cup of water, the straw appears bent or broken at the water line. Which wave interaction causes this optical illusion?

Refraction, because light changes speed as it travels from air into water Reflection, because light bounces off the surface of the plastic straw Diffraction, because light waves bend around the edges of the cup Absorption, because water absorbs red wavelengths of light

Correct Answer:

Refraction, because light changes speed as it travels from air into water

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