SC MYP2T2Q4 LIGHT/SHADOW

Thermal energy

AKA heat energy: Through the motion of the object’s particles, the energy of the object becomes hot.

Radiation

is the way that heat energy is transferred by hot objects emitting infrared waves.

Infrared waves

are part of the electromagnetic spectrum. They are emitted by hot objects.

Electromagnetic spectrum

is a spectrum of waves that includes visible light and infrared radiation as well as radio waves, microwaves, ultraviolet, X-rays and gamma rays.

Visible light

is a type of electromagnetic wave that our eyes are able to detect.

Microwaves

are a type of electromagnetic wave with wavelengths between 1 mm and 1 m. They are used for some communications and for heating food in microwave ovens.

Radio waves

are a type of electromagnetic wave with a long wavelength. They are used for communication.

X-rays

are a type of electromagnetic wave with a very short wavelength. X-rays are able to pass through matter. This property means that they are useful for medical imaging.

Reflection

occurs when a wave bounces off a surface.

Angle of reflection

is the angle between the normal and the reflected ray.

Angle of incidence

is the angle at which a ray hits a surface. The angle is measured to the normal.

Law of reflection

states that the angle of incidence is equal to the angle of reflection.

the normal

is a line that is at a right angle to the surface.

A specular reflection

is a reflection off a shiny surface in which a reflected image can be seen.

A diffuse reflection

is a reflection of light off a surface that is not shiny enough for a reflected image to be seen.

A rainbow

is a naturally occurring effect where sunlight is spilt into a spectrum of colors

The visible light spectrum

is a spread of colours.

What is the order of the visible light spectrum?

The order of these colours in the spectrum is red, orange, yellow, green, blue, indigo and violet.

What are the colours of the visible light spectrum also known as?

Spectral colours

Why do shadows form?

Shadows form due to an opaque/translucent object blocking the path of light from a source.

Name 7 parts of the eye

Cornea, iris, pupil, eyelid, lens, retina and optical nerve.

What is the difference between reflection and refraction?

Reflection: light bounces off a surface of an object. Refraction: light passes through an object.