Which location of the periodic table contains the halogens

Which statement about covalent bonds is true

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.

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane