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8J
Key Stage 3 Science
| Question | Answer |
|---|---|
| What does the term absorb mean? | ‘To soak up’ or ‘to take in’. |
| Explain what an opaque material is? | Material that does not let light through some is reflected and some is absorbed. It is not possible to see through an opaque substance. |
| How are shadows formed? | A place where light cannot get to, because an opaque object is blocking the light. |
| What does translucent mean? | Material that lets light through but scatters it. You cannot see things clearly through translucent materials. |
| What is a vacuum? | A completely empty space, containing no particles. |
| What is the law of relfection | The angle of incidence= angle of reflection. |
| What is diffuse reflection | Reflection from a rough surface, where the reflected light is scattered in all directions. |
| What does the term laterally inverted mean? | The left and right are swopped over. |
| Draw a labelled ray diagram showing the law of reflection | |
| What instrument is used to measure angles? | protractor |
| What is a virtual image | A virtual image appears to come from behind the lens. |
| What does the word transmit mean? | To pass through a substance. |
| What is an opaque material | A material that allows no light through. It is either reflected or absorbed |
| What is a translucent material | A material that allows some light through |
| What is a transparent material | A material that allows all light through |
| Complete the ray diagram of the mirror | |
| What is the dotted line called in the previous question | The normal |
| What is the name of the ray labelled I and r. | Ray of incidence and Ray of refraction |
| Name the 3 primary colours of light | Red, Green and Blue |
| White light is made of up seven different colours Red, Orange, Yellow, __a_, __b_, Indigo and __c_. What are the 3 missing colours? | a) Green b) Blue c) Violet |
| How does a red filter produce red light from white light? | Red light is transmitted and all the other colours are absorbed |
| What does the term absorb mean? | ‘To soak up’ or ‘to take in’. |
| Explain what an opaque material is? | Material that does not let light through some is reflected and some is absorbed. It is not possible to see through an opaque substance. |
| How are shadows formed? | A place where light cannot get to, because an opaque object is blocking the light. |
| What does translucent mean? | Material that lets light through but scatters it. You cannot see things clearly through translucent materials. |
| What is a vacuum? | A completely empty space, containing no particles. |
| What is the law of relfection | The angle of incidence= angle of reflection. |
| What is diffuse reflection | Reflection from a rough surface, where the reflected light is scattered in all directions. |
| What does the term laterally inverted mean? | The left and right are swopped over. |
| What instrument is used to measure angles? | protractor |
| What is a virtual image | A virtual image appears to come from behind the lens. |
| What does the word transmit mean? | To pass through a substance. |
| What can you state about the size of an image in a mirror? | It is the same size as the object |
| What type of image is formed by a mirror? | Virtual |
| What is specular reflection? | When light is reflected evenly, so that all reflected light goes off in the same direction. Mirrors produce specular reflection. |
| What is refraction? | The change in in speed and direction when light goes from one transparent material to another. |
| When light travels from air to glass does it bend towards or away from the normal? | It bends towards the normal |
| Does light speed up or slow down as it travels from air to glass? | It slows down. |
| What are the 3 primary colours? | Red, green and blue |
| What does the term dispersion mean? | The separating of the colours in light, for example when white light passes through a prism. |
| What are the colours that make up the visible spectrum? | Red Orange Yellow Green Blue Indigo Violet |
| Why do objects appear blue in white light? | Blue light is reflected and all other colours are absorbed? |
| What colour will a blue object appear in red light? Explain your answer. | It will appear black, as the blue object will absorb the red light and none will be reflected. |
| What does the term frequency mean? | The number of vibrations (or the number of waves) per second. |
| State the relationship between incident and reflected angles | Angle of incidence=angle of reflection |
| Define "refraction" | Change of direction of light going from one material into another |
| Define "incident ray" | The incoming ray |
| Define "normal line" | Line at right angles to the surface, from which angles are measured |
| Define "absorption" | When energy is transferred from light to a material |
| Define "scattering" | When light bounces off an object in all directions |
| Define "transparent" | Material that allows all light to pass through it |
| Define "translucent" | Material that allows some light to pass through it |
| Define "opaque" | Material that allows no light to pass through |
| State the speed of light | 300000000m/s |
| Name five parts of the eye | Retina, iris, pupil, optic nerve, lens |
| State the function of the retina | Layer at the back of the eye with light-detecting cells and where an image is formed |
| State the function of the pupil | Hole in the middle of the iris that allows light to pass through and enter the eye |
| State the function of the lens | Refracts light to focus on the retina |
| State the function of the optic nerve | Carries signals to the brain |
| Name the diagram used to show how light travels | Ray diagram |
| Name the piece of experimental equipment that emits light | Ray box |
Created by:
Davenant Foundation School
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