A type of optical telescope that uses a lens as its objective to form an image.
refracting
Is an optical telescope which uses curved mirrors that reflect light and form an image.
reflecting
The _____lens in a telescope focuses the light to a point in front of the eyepiece.
objective
Another word for nearsightedness
myopia
Images are formed behind the retina, not on it, and this causes close-up images to be blurry.
hyperopia
The most common cause of blindness
cataracts
The pupil gets____in bright light.
smaller
The aqueous humour is the ____fluid, that fills the front part of the eyeball.
clear
The ___ spot is where the optic nerve leaves the retina.
blind
The coloured part of the eye.
iris
The _____body is a circular muscle that enables the lens to change shape for focusing.
ciliary
The _____is a layer of blood vessels that nourishes the eye.
choroid
With refraction of light no image is formed when the object is at the_____point.
focal
A lens that makes light rays come together is called a _____lens.
convex
These lenses make light spread apart.
concave
A _____and dark-coloured surface will absorb light the most.
rough
Concave mirrors are also called _________mirrors
converging
Your image will be upright, but much smaller than what you normally see in this kind of mirror.
plane
The ability to let light rays in.
transparent
Light can partially get through..
translucent
Allows no light to get through.
Opaque
,Light can travel in a straight line just like _____.
waves
When the sunlight passes from the air through rain droplets before reaching your eyes, what is this called?
dispersion
Different _______of light have different wavelengths.
colours
Where does the energy of the electromagnetic spectrum come from?
sun
,As the wavelength gets shorter, both the frequency and energy _______.
increase
Which rays are the highest forms of electromagnetic radiation?
gamma
Waves where the particles of the medium vibrate with an up and down motion.
transverse
What is the branch of science called that deals with the study of waves that travel through the Earth?
seismology
What kind of wave can you see on the water on a windy day?
surface

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