Questions with the keyword 'optics'

• I drew an arrow on a piece of paper and I then put a drinking glass infront of it. I poured some water into the glass by friartrout to Adam, Catherine, Karen, Leila, Nazim Comments: (No comments so far )
• If the colour we see is just a reflection, does that mean that everyting really has no colour? by stevebuck to Adam, Catherine, Karen, Leila, Nazim Comments: (No comments so far )