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| Question | Answer |
|---|---|
| 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
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