Which best explains why the diagram shows refraction but not reflection? a. it shows an incident ray. b. it shows that the ray is changing direction. c. it shows the ray passing through the boundary. d. it shows that angles form between the rays and the normal.

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.