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8K Light

What is a ray? What does it tell us about how light travels? A ray is a beam of light drawn on a diagram as a straight line, it shows us how light travels in a straight line and what direction the light is traveling
How can we see objects? When light enters our eyes. Objects look different depending on the amount, direction, and colour of the light entering the eye.
What is a luminous source? An object that gives off light. We can see it because the light goes directly into our eyes.
How can we see non-luminous sources? We can see objects that do not give off light because light from luminous sources reflects (bounces) off of them and then enters our eye.
How are shadows produced? Shadows are produced when light cannot go through an object and creates a dark image.
Why can we see through transparent materials? The light is transmitted (passes through) directly through transparent materials and can enter directly into our eye.
What kind of image would you see behind a translucent material? Light can only partially pass through a translucent material so you would see a blurry or shadowy image.
What happens to light when it hits opaque materials? Light cannot travel through opaque materials, it is either absorbed into the material or reflected away.
What does it mean for light to be reflected or absorbed? Reflected light bounces off and away from the object. Absorbed light is sucked in or taken in by the object and does not come back out.
How does your eye work? 1) light enters the pupil, which controls how much light enters 2) the light passes through a lens that focuses the light onto the back of the eye forming a tiny upside down image 3) the retina at the back of the eye changes the light into a signal
Why can we see an image in a mirror but not a piece of paper? Mirrors are smooth surfaces that reflect the light evenly. Rougher surfaces reflect light in all directions, the light is scattered, and does not create am image.
Draw a ray diagram for how light is reflected off a plane mirror. Includes: mirror, normal, incident ray, reflected ray, angle of incidence, angle of reflection
The angle of incidence is (larger, smaller, or equal) to the angle of reflection? Equal
Rules for reflection in a plane mirror. Image is the same size as object, image is same distance behind as object is in fron of mirror, left and right are swapped, angle of incidence = angle of reflection
What do lenses do? Bend light as it passes through them, made of a transparent material, like plastic or glass.
What is refraction? Refraction is when light changes direction when it enters a transparent material of a different density.
What is an interface? It is the surface where two different materials meet.
Draw a ray digram to show the path of light as it passes through a glass block. Shows a straight ray coming into the block, ray bends towards the normal as it enters the block, bends back to its same angle as it passes out of the block.
Draw a converging lens. Draw a diverging lens. Converging lens is fatter in the center, thinner on the edges (focuses light); diverging lens is thicker at the edges and thinner in the center (spreads out the light).
What colours are there in white light? All colours of the rainbow; red, orange, yellow, green, blue, indigo, violet (called the spectrum)
How do you separate white light into the different colours? Use a prism, the colours of the light are bent different amounts as they enter the prism and bend even more apart as they exit the prism, separating into the different colours.
How does a coloured filter work? A coloured filter absorbs all the colours except one, only transmits (lets through) one colour of light.
How do the following coloured objects look under a green light; red hat, green hat, white hat, black hat? Red hat looks black, green hat looks green, white hat looks green, black hat looks black.
Created by: missluu