optics Flashcards
(23 cards)
what lens corrects long sight
convex lens
what does the lens do
it focuses light on the retina
what is the pupil
a hole at the front of your eye that allows light to enter
what lens corrects short sight
concave lens
what are dangers of a x-ray
burns, skin cancer and eye cancer
when white light is shone through a glass prism it splits up into the different colours it sits made up of. What ate the colours
red
orange
yellow
green
blue
indigo
violet
what is the name given to a line that is drawn at 90 degrees to a mirror
the normal line
what are radio waves used for
contacting people
what are the dangers of infrared waves
there are none
what is a gamma ray used for
sterilising surgical instruments
what is a use for ultraviolet rays
treating vitamin D deficiency
what is the iris
a coloured muscle that alters the size of the pupil. It also controls the amount of light entering the eye
what is the cornea
a tough outer coat which is clear. It also refracts light
what is the retina
a light sensitive layer that converts light to electrical impulses at the back of the eye
what ate uses of radio waves
mobile phone, radio and tv
whais the name of all the colours
visible spectrum
what is the order of the electromagnetic spectrum
radio
microwave
infrared
visable light
uv
x-ray
gamma ray
what are the uses of x-ray
scan bones in a hospital
scan bags at an airport
what are the two safest waves in the electric magnetic spectrum
radio and microwave
what is the most dangerous wave in the spectrum
gamma ray
dangers of uv rays
none
does light travel in straight lines
yes
true or false light travels through air at a speed of 300 million meters per seconds
true
