Nursing 104: Light Vision

What type of wave is Light?

Transverse

What is a transverse wave?

“A wave in which the medium vibrates at right angles to the direction of the propagation.” (like a slinky)

How fast does light travel?

300,000 km/sec

ARe radio waves light waves or sound waves?

Light waves

Radio waves are the longest waves, true or false

^true

What are radio waves used for?

Primary means of communication – carry signals for TV, radio and
cellphones, garage door opener, GPS AND THE MRI IN THE HOSPITAL

Can radio waves pass through metal?

no

Infa-red Light: Which side on the scale is far- infrared closest too.

The mircrowave side

Visible Light

this is the specturum of light humans can see, 400-700nm, it is the colour we can see.

What is luminosity

Luminous objects produce/emit light - eg lightbulb, sun

Reflectivity:

Like a mirror it relfects light, does not to produce it, eg -water, mirror.

Refraction:

“The bending of light as it changes
from one medium to another” eg- seeing fish under water but they are actually not exactly there.

Polarized ight

Electric and magnetic fields oscillate in
one plane

Unpolarised light:

Electromagnetic fields oscillate in all
possible directions

Hyperopia

long-sightedness is the condition when images are focussed behind the retina causing blurring or eye strain. you can see things in distance but not close up

Myopia

or short-sightedness is the condition when images are focussed in front of the retina causing distant objects to appear
blurred.