science

black circle that we see in the middle of the eye

is the bending of light when it passes from one medium to another.

is related to the transparency of a material to light

is the ratio of the speed of light in a vacuum

is any piece of transparency material that has at least one spherical surface

a lens thicker in the middle than at the edges

a lens thicker in the edges than in the middle

is the point which all rays pass without being bent

is the distance from the optical center of the lens to the principal focus

is the line joining the optical center and the principal focus

is an opaque ball around 2.3 cm in diameter

thin transparent membrane covering the eyeball

is the thin transparent tissue that lines the inner surfaces of the eyelids and the outer surface of the eyeball

the white background

a black circle that we see in the middle of the eye

the colored circle of the eye

a clear convex structure behind the pupil

are attached to the crystalline lens and are responsible for changing the shape of the lens

is located at the back of the eyeball

carries images from the retina to the brain

the closest distance at which the object can be seen cleary by the eye

the farthest distance at which the object can be seen cleary by the eye

people suffering from this vision problem can see clearly nearby objects, but distant objects are blurry

people with this condition can see distant objects but cannot focus on nearby objects

something called "aging eyes" or "old eyes"

a person who diagnoses eye problem and is licensed to prescribe medication and perform eye surgery

is considered as the mechanical eye because its part and their functions are analogous to those of the eye

literally mean dark chamber

arab-persian scientist who is credited as the inventor of camera obscura

created the first photographic camera

is a converging lens that forms a virtual, enlarged, and upright image

consist of converging lens in the objective and a magnifying glass in the eyepiece

the first telescope invented

a german-dutch lens maker invented the first refracting telescope using two converging lenses and called it "____"

invented a refracting telescope using converging lens for the objective and a diverging lens for the eyepiece. he was the first person yo use a telescope to study celestial objects

invented the reflecting telescope in 1668

is a device that enables people to see distant object

is a mixture of two or more metals

is a space around a magnet in which its force affects objects

in denmark discovered that an electric current is surrounded by a magnetic field

an instrument used for detecting or measuring small electric currents

another popular device operated by an electromagnet

it is similar in construction to the electric bell

an English scientist, discovered that a movingwire through a magnetic field could produce an electric current

made a similar discovery. A current produced by a magnetic field is an induced current