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8J

Key Stage 3 Science

QuestionAnswer
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
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