light and optics Flashcards
quest??
what is the law of reflection
The angle of incidence will always match the angle of reflection
How do you measure the angle of reflection and incidence
Measure it from the reflective surface (if the angle doesn’t match it’s wrong)
How will the angle of a light beam change when it passes through different densities
When light travels through a less dense medium to a more dense medium it bends toward the normal, and when it goes through a more dense medium to a less dense medium it bends away from the normal
What does a diagram of a spectrum look like?
The beam of white light will pass through a prism, and exit it as a spectrum of colours (roygbiv)
- since red had the longest wavelength it will travel the farthest
What happens to a light beam when it passes through a double or single convex lens
single:the light rays will enter and be refracted inwards to a focal point
Double: the light rays will enter and be refracted 2 time and it will result in more refracted rays
What happens to a light beam when it passes through a double or single concave lens
single: the light rays will enter and be refracted outwards, away from the middle beam (which will stay the same and continue straight
double: the light ray will enter and be refracted twice (outside and inside). this will result in more refracted ways the the focus will be closer to the lens
What is nearsightedness
the lens of your eye focuses the light before your retin causeing objects that are far away appear blurry and out of focus
What causes nearsightedness
When your lens is focusing the light before it can reach the retina
What is farsightedness
When objects nearby appear blurry and out of focus
What causes farsightedness
Your lens focusing the light after the retina
How do we fix farsightedness
Glasses or corrective lenses (convex lenses)
What are the 9 parts of the eye?
retina
vitreas humorous
iris
Pupil
Optic nerve
muscles
aqueous humorous
Cornea
lens
What does the retina do
- captures the light that enters the eye
- converts the light/interprets the light
What does the vitreous humorous do
- Mainly provides volume and makes the shape and provides nutrients to the eye
- bodily fluid found in the eye
What does the iris do
Controls the amount of light entering the eye
What does the pupil do
Allows light to enter the eye
What does the optic nerve do
sends electrical signals to your brain (these signals describe what the eye sees)
What do the ciliary muscles do
- Change the shape of the lens
- when they get older they get elasticized w age they become weak
- permit accommodation
What does the lens do
- refract/focus the incoming light coming onto the retina
- if it is misshapen it causes near/farsightedness
what does the aqueous humour do
- found in the interior chamber
- Provides hydration and nutrients
- Nourishes the front part of the eye
- Helps with refraction
- bodily fluid found in the eye
what does the cornea do
- Protects the eye
- Refracts light
