Please explain and help

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above

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.