not my answer just editing.... but your link is below.
the phenomenon of refraction. When light travels from one medium (such as air) to another medium with a different optical density (such as water), it changes speed and direction, causing the light rays to bend. This bending of light can make the stick appear broken or bent at the water's surface.
See the link for one good picture.you can go on Google.com/pictures of Jane Goodall.Answer
See the link below for pictures of some nonmetals.
If by "straight on" you mean at 90 degrees to the surface of the medium, that is because light is only deviated if it makes an angle with the normal, which is an imaginary line perpendicular to the surface of the medium. If no angle is made between the normal line and the light ray, then no refraction occurs and the light passes through in a straight line. For more information see the related link below.
Refraction ~ look to related link below .
There is a good site for Chameleon pictures in the related link
Check out the link(s) below, please:
not my answer just editing.... but your link is below.
Follow the link below for very good pictures of mitosis.
There is a good picture at link below.
Go to the related link found below this answer box. It has good information and some pretty good pictures too.
See related link for pictures of Angela Merkel.
the phenomenon of refraction. When light travels from one medium (such as air) to another medium with a different optical density (such as water), it changes speed and direction, causing the light rays to bend. This bending of light can make the stick appear broken or bent at the water's surface.
A moon dog (moondog), or paraselene, is a lunar halo caused by light refraction off ice crystals high in the atmosphere. A link can be found below.
Photoshop online. See related link.
See related links for pictures of a Euphonium.