Term
| Describe a converging lens |
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Definition
| thicker in the middle, tapered on the ends. () |
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Term
| Describe a diverging lens |
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Definition
| thicker on the ends, tapered in the middle. )( |
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Term
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Definition
| angle between incident ray and normal |
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Term
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Definition
| angle between refracted ray and normal |
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Term
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Definition
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Term
| images in mirrors are ______ inverted |
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Definition
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Term
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Definition
| The line through the centre of curvature to the midpoint of the mirror |
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Term
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Definition
| The point where the principal axis meets the mirror |
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Term
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Definition
| the centre of the “sphere” whose surface has been used to make the mirror |
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Term
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Definition
| the point at which the light rays parallel to the principal axis converge when they are reflected off the mirror (Located behind the mirror for diverging mirrors |
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Term
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Definition
| the distance between the vertex and the focus |
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Term
| For a concave(converging) mirror, light rays parallel to the principal axis converge here |
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Definition
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Term
| In a convex(diverging mirror), what is the focus point? |
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Definition
| Where the reflected rays appear to originate from; the brain traces them back to this point. |
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Term
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Definition
| Size (Smaller, larger), Attitude (Upright or inverted), Location, Type (Real or virtual) |
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Term
| focal length is negative if mirror is: |
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Definition
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Term
| distance of image is negative if: |
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Definition
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Term
| height of image is _______ if measured down from: |
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Definition
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Term
| light travels fastest in a ___________ |
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Definition
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Term
| what is the speed of light in a vacuum? |
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Definition
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Term
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Definition
| it travels at different speeds in different mediums |
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Term
| A ray going from a faster medium to a slower medium will bend towards/away from the normal. |
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Definition
| A ray going from a faster medium to a slower medium will bend towards the normal. |
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Term
| Light travelling from a slower medium to a faster one will: |
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Definition
| bend away from the normal |
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Term
| Rays that enter mediums at curved boundaries refract: |
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Definition
| the same way they do when the boundary is straight |
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Term
| True/false: sometimes both reflection and refraction occur |
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Definition
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Term
| What is the critical angle of a medium? |
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Definition
| the angle before total internal reflection will occur. |
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Term
| How do you find the critical angle? |
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Definition
Use Snell's law (n1sinθ1=n2sinθ2), and set
θr to 90 degrees |
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Term
| Describe total internal reflection. |
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Definition
| When the angle of refraction is ninety degrees and light travels along the boundary of a medium, unable to escape until the end. |
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Term
| Give an example of when total internal reflection is used. |
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Definition
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Term
With converging lenses, the focus is
a) on the same side as the object
b) on the different side of the object |
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Definition
| b)on the different side of the object. |
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Term
Diverging lenses have the focus on the
a)same side of the object
b)different side of the object |
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Definition
| 1)on the same side of the object |
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Term
| What is the cornea and what does it do? |
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Definition
| The outer surface of your eye, where light enters. Even though it's made of living cells, it's completely clear. |
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Term
| What is the hole that allows light to pass into the eye? |
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Definition
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Term
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Definition
| The iris controls the amount of light entering the eye. In bright light,it contracts,and it dilates in dim light. |
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Term
| This inner lining at the back of your eye acts as a form of projection screen for light entering your eye. |
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Definition
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Term
| Describe the lens of your eye. |
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Definition
| A convex lens that lets you focus on an object no matter where it is. Controlled by a circle of muscles that, when contracted, shrink the lens to see up close, and relax to expand the lens to see distant objects. |
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Term
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Definition
| Cells in the retina that are receptive to light; rods and cones. Rods detect shape, while cones detect color (red, green, and blue) |
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Term
| How does the eye work? Describe the process. |
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Definition
| Light passes through the cornea, and then through the retina to the lens, where photoreceptors change the light into impulses that are sent along the optic nerve to the brain. |
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Term
| What is the medical name for far-sightedness? Describe the condition and what type of lens you would need to fix it. |
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Definition
| Hyperopia. When the distance between the retina and the lens is too short, or the corneal lens is too weak. The problem is fixed with a converging lens. |
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Term
Farsightedness can also be related to age, in which case it is called ______.
How is this caused? |
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Definition
| Presbyopia; when the lens becomes too rigid to flex and thus you can't focus well. |
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Term
| What is myopia, what causes it, and what lens is needed to fix it? |
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Definition
| Myopia is near-sightedness (meaning you can see near). This is when the distance between the lens and the retina is too large, or when the corneal lens is too strong. Fixed with a diverging lens. |
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Term
| What is astigmatism, how does it affect those who have it, and what type of lens is needed to fix it? |
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Definition
| An irregularly shaped eye; one can see only along either horizontal/vertical lines, and not the other way. Fixed with a cylindrical lens. |
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Term
| Can electromagnetic fields travel through empty space? |
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Definition
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Term
| What are electromagnetic waves? |
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Definition
| Wave pattern of electric and magnetic fields. (Never would have guessed.) |
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Term
| Low energy electromagnetic waves have: ____ frequency and ____ waves. |
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Definition
| Low energy waves have low frequency and long waves. |
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Term
| High energy electromagnetic waves have ______ frequency and ______ waves. |
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Definition
| High frequency and small waves. |
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Term
| Name the type of light in order of frequency, lowest to highest. |
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Definition
o Radio Waves
o Microwaves
o Infrared
o Visible light (All the colours ROYGBIV)
o Ultraviolet
o X-rays
o Gamma rays |
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Term
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Definition
| White light is made up of all the different types of visible light; when white light is passed through a prism, the different wavelengths bend different amounts, dispersing and showing us a visible spectrum. |
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Term
| What is bioluminescence? Give an example of where it is found. |
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Definition
| The production and emission of light from a living creature; e.g. a firefly |
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Term
| Light produced by an object at a high temperature is called: |
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Definition
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Term
| True or false: incandescent light is extremely inefficient? |
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Definition
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Term
| Describe fluorescent light. |
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Definition
| Light emitted by a substance when exposed to electromagnetic radiation. |
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Term
| How do fluorescent light bulbs work? |
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Definition
| When electricity passes through bulbs, atoms in the gas are energized, releasing UV radiation, which strikes the phosphor and makes it glow and release light. |
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Term
| ________ is the ability to store energy from a light source and then emit it over a longer period of time. For example, glow in the dark objects |
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Definition
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Term
| Producing light from friction (like smashing hard candies) is called: |
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Definition
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Term
| What is electric discharge? |
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Definition
| When electricity is passed through the air or another gas and produces light (like neon). |
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Term
| ________ is the process of turning electricity directly into light (like in LEDs) |
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Definition
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Term
| Equation with the focus, distance of object, and the distance of image. Can be used to find either. |
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Definition
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Term
| The formula for magnification. |
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Definition
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