Concave and Convex Lenses
Concave lenses make large and upside down images (also stretched) while convex lenses make small, right side up images.
Concave reflects light inward and convex outward.
Both lenses can be used for telescopes.
Your brain tries to focus the illusion and will either try to focus it or fill the gaps in.
Hermann Grid illusion is when the brain makes up black dots to fill in the gaps.
Twirling girl, dancer is going both clockwise and counter- clockwise because the image is actually 2D
Afterimage illusison is when you stare at a picture and then look at a wall.
Diseases that Affects Eyes
Colorblind: Red and green are the hardest to see.
You can’t be a pilot if colorblind.
Boys are more likely to be colorblind from their moms because they have only one “X” gene.
Some medicines can make you colorblind.
How do we see?
Photoelasticity is when light refracts off the clear spoon to show where pressure has been put.
We have rods and cones. Cones help us see color and rods tell us how intense light is.
Our brain turns the image we see rightside up.
Pilots can’t wear them because they block light off the dashboard.
Glasses make unpolarized light to polarized light.
Polarized glasses bend light because they have thin horizontal lines in lenses.
What can light do?
Light will refract when going through water (reversing objects).
Light reflects off mirrors because mirrors are smooth.
Light scatters when there is not a smooth surface. These bumps are microscopic.