Question |
Answer |
Light is a form of _____ |
Energy |
What do you call the instrument whose vanes move when light shine on them |
Crookes radiometer |
What do you call an object that gives out light |
Luminous object |
What do you call an object that does not give out light |
Non-luminous object |
How does light travel |
Straight lines |
To demonstrate that light travels in straight lines you would need what apparatus |
Cardboard sheets with hole and a light |
What is created if an object blocks light |
Shadow |
What do you call the part of a shadow where light is blocked completely |
Total shadow |
What do you call the part of a shadow where some light is getting through |
Partial shadow |
Light bouncing back of an object is called what |
Reflection |
In reflection the angle that light rays hit an onbject is of entry is _______ to the exit angle |
Equal |
What do you call an object that can emit a narrow beam of light |
Raybox |
What do you call an object that can be used to see over a wall |
Periscope |
How many mirrors are in a periscope |
Two |
What angle are the mirrors in a periscope positioned |
45 degrees |
What do you call the bending of light from one medium to another |
Refraction |
In refraction why does the object appear bent |
Different mediums have different density |
Give another name for a concave lens |
Converging lens |
Give another name for a convex lens |
Diverging lens |
What type of lens will bring light rays together |
Convex lens |
What type of lens spreads light rays out |
Concave lens |
How many colours make up white light |
Seven |
What do you call the breaking up of white light into its colours |
Dispersion |
What do you call the triangular glass block used to break up white light |
Prism |
What term is given to the band of seven colours |
Spectrum |
What colour is missing, red, orange, green, blue, indigo, violet |
Yellow |