Lights and Optics

The fully shaded part of the shadow is called __________.

Umbra

The partially shaded part of the shadow is known as __________.

Penumbra

A material that reflects or absorbs all light that reaches it is referred to as __________.

Opaque

Material that allows all light to pass through is called __________.

Transparent

Material that allows some light to pass through is described as __________.

Translucent

The amount of light spread over a specific area is known as __________.

Illuminance

When light reflects off a smooth surface, it is called __________ Reflection.

Specular

When light reflects off a rough surface, this is known as __________ Reflection.

Diffuse

The angle between the incoming ray and the normal is referred to as the __________.

Angle of Incidence

The angle between the reflected ray and the normal is called __________.

Angle of Reflection

A line that is perpendicular to the mirror is known as __________.

Normal

The law stating that the angle of incidence is equal to the angle of reflection is known as __________.

Law of Reflection

When light travels in a straight line within the same medium, this is called __________ Propagation.

Rectilinear

A mirror in which the reflected surface is curved outwards is known as a __________ Mirror.

Convex

A mirror with a reflecting surface that is curved inward is called a __________ Mirror.

Concave

A __________ Lens is thicker in the middle than at the edges and brings light rays together.

Convex

A __________ Lens is thinner in the middle than at the edges and spreads light rays apart.

Concave

When light changes direction while passing from one substance to another, this is known as __________.

Refraction

The measure of how much the speed of light is reduced in a material is called __________ Index.

Refractive

The transparent front part of the eye that focuses light is called the __________.

Cornea

The opening that controls the amount of light entering the eye is known as the __________.

Pupil

The colored part of the eye that regulates the size of the pupil is called the __________.

Iris

The transparent structure that focuses light rays onto the retina is called the __________.

Lens (Eye)

Muscles that change the shape of the lens to focus light are known as __________ Muscles.

Ciliary

The white, tough outer layer of the eye providing support is called the __________.

Sclera

The light-sensitive layer at the back of the eye is known as the __________.

Retina

The nerve that transmits visual signals from the retina to the brain is called the __________ __________.

Optic Nerve

Low energy waves with the longest wavelength are called __________ Waves.

Radio

Waves that are only longer than radio waves are called __________ Waves.

Microwaves

Invisible electromagnetic waves detected as heat are known as __________ Radiation.

Infrared

The portion of the electromagnetic spectrum visible to human eyes is called __________ Light.

Visible

Higher energy than light waves are referred to as __________ Light.

Ultra Violet

High energy waves are known as __________ Rays.

X

The highest energy waves blocked by the Earth's atmosphere are called __________ Rays.

Gamma

The model involving adding colours to create other colours is known as __________ Colour Model.

Additive

The model in which pigments mix to create new colours is called __________ Colour Model.

Subtractive

The three colours detected by our cones are known as __________ Colours.

Primary

When two primary colours are mixed, they form __________ Colours.

Secondary

Any two colours of light mixed together that produce white are called __________ Colour.

Complementary

A chemical that absorbs certain colours of light and reflects others is known as a __________.

Pigment