Which of the following statements is true? a. a convex lens is thicker in the middle and refracts light inward. b. a convex lens is thinner in the middle and refracts light inward. c. a convex lens is thicker in the middle and refracts light outward. d. a convex lens is thinner in the middle and refracts light outward.

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

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.

Part a constants huck finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft's motion what is huck's velocity (speed and direction) relative to the river bank? express your answer to three significant figures and include the appropriate units. relative to the shore)