Sound waves and light waves reflect from surfaces. The angle of incidence equals the angle of reflection. This is called the law of reflection. So, if a wave hits a mirror at an angle of 36°, it will be reflected at the same angle. The angle of refraction suggests that the change of direction of a ray of light, or the like, in passing obliquely/direction from one medium into another in which its wave velocity is different.
Chloe and Nurb are saying that the pupil can go big and small. On a camera, the aperture is used to blur the background and foreground. Also, the pupils let in light depending whether the pupil is big or small. Big: more light. Small: less light (dim). The lens can focus on what you see whether the item is far and narrow. Then the optic nerve sends messages to the brain. A picture is similar as the light and 'message' has been transmitted to the 'brain'.
light theory |
When light hits an object – say, grass – the object absorbs some of the light and reflects the rest of it. Which wavelengths are reflected or absorbed depends on the properties of the object.
When you look at the grass, the wavelengths of reflected light determine what color you see. The light waves reflect off the grass and hit the light-sensitive retina at the back of your eye. That's where cones come in.
When you look at the grass, the wavelengths of reflected light determine what color you see. The light waves reflect off the grass and hit the light-sensitive retina at the back of your eye. That's where cones come in.
So, we now know the light-sensitive retina will reflect waves. But actually, the cornea allows us to see the grass green; banana yellow; blood as red.
Spectrum of light
White light to form a spectrum. You need all the colours of the rainbow. So, if you add red, orange, yellow, green, blue, indigo and violet, you'll get the colour white.