ELECTROMAGNETIC SPECTRUM
What type of electromagnetic wave can humans see?
Visible light.
What type of wave has vibrations at right angles to the direction of travel?
Transverse waves.
What is it called when light bounces off a surface?
Reflection.
What part of the eye controls the amount of light entering?
The pupil.
What type of lens bends light inward to a focal point?
A convex lens.
Which electromagnetic waves have the longest wavelength?
Radio waves.
What type of wave has vibrations parallel to the direction of travel?
Longitudinal waves.
What is it called when light bends as it enters a new medium?
Refraction.
What part of the eye is a transparent layer that helps focus light?
The cornea.
What type of lens spreads light outwards?
A concave lens.
Which electromagnetic waves cause sunburn?
Ultraviolet (UV) waves.
What type of wave is sound?
A longitudinal wave.
What do dark surfaces do to most of the light that hits them?
Absorb it.
Which part of the eye contains light-sensitive cells?
The retina.
What do short-sighted people have trouble seeing?
Distant objects.
Which electromagnetic waves have the shortest wavelength and highest frequency?
Gamma rays.
What type of wave is light?
A transverse wave.
What angle is always equal to the angle of reflection?
The angle of incidence.
What carries visual information from the eye to the brain?
The optic nerve.
What type of lens corrects long-sightedness?
A convex lens.
What two properties change across the electromagnetic spectrum?
Wavelength and frequency.
Which two properties determine a wave’s speed?
Wavelength and frequency.
What are the two types of reflection of light
Specular Reflection and Diffuse Reflection
What muscles change the shape of the lens to focus light?
The ciliary muscles.
Why does short-sightedness occur?
The eyeball is too long (or the lens is too strong).