You can increase friction by

a. making the surface rougher

b. using oil or another lubricant

c. putting the object
on wheels

d. asking a friend to push or pull

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.