Ray Tracing
What are the 3 sets of terms used to described a reflected or refracted image?
real / virtual
inverted / upright
magnified / reduced
Is there a way to predict the angle of refraction (how much waves bend between mediums)?
Snell's Law:
n(1) * sin(theta 1)= n(2) * sin(theta 2)
Who said the eye is a such a sophisticated work of engineering that the very idea of it forming by evolution is preposterous?
The Law of Reflection.
Which physicist unified the electric and magnetic forces into a single electromagnetic force?
James Clerk Maxwell
(5 min) Using ray tracing draw the created image formed by a converging lens when the object is outside the focal point. (#1).
See Converging Lenses #1 drawing.
Define the index of refraction, and the specific index of refraction of air.
The ratio of speed of light in a vacuum / speed of light in another medium.
Index of refraction of air is = 1.00
What part of the eye regulates how much light enters the eye?
The iris.
What is the difference between a real image and a virual image?
Real images are created by intersecting light beams. Virtual images are created by extrapolating light beams.
Which physicist wrote to a president discussing the possibility of making an atomic bomb?
Albert Einstein wrote to FDR
(5 min) Using ray tracing draw the created image formed by a converging lens when the object is inside the focal point. (#2).
Converging Lenses #2 drawing.
The process by which a light ray bends when it encounters a new medium.
What is refraction?
When the lens/cornea cannot bend light strongly enough, you have ______.
What is Hyperopia?
If you are doing a very precise optical experiment and need a curved mirror that will sharply focus all horizontal light rays to a single point, which kind of mirror should you use: parabolic or spherical?
A parabolic mirror b/c they have no spherical aberrations.
What is the different between reflection and refraction?
With regards to reflection, the incident ray is reflected when it strikes the point of incidence.
With regards to refraction, the incident ray is refracted (bent) when it strikes the point of incidence and enters a new medium.
(5 min) Using ray tracing draw the created image formed by a diverging lens when the object is outside the focal point. (#1).
Diverging Lenses drawing #1
The separation of white light into a spectrum of colors.
What is dispersion?
When the lens/cornea focuses light too strongly, you have _______.
What is Myopia?
Explain why you can see through a window but you can also see your reflection in the window as well.
When light hits transparent object, part of the light goes through (so you can see outside), but the rest of the light is reflected (by which you see your reflection).
Photons (pg 373)
(5 min) Using ray tracing draw the created image formed by a diverging lens when the object is inside the focal point. (#1).
Diverging Lenses drawing #2
Why does light bend (refract) when it moves from the medium of air to the medium of glass?
Light travels at different speeds depending on the medium. The frequency of a light wave must be the same in both the air and the glass. Since the wave travels more slowly in glass, the wavelength is shortened (bends) (when moving from air to glass) so that the frequency of the wave does not change.
What muscle squeezes or expands the lens, changing the lens focal point, in order to keep the image in focus?
The ciliary muscle.
Which physicist named in Discoverers, wrote a book called, "Optics"?
Sir Isaac Newton
(5 min) A light beam shines on a pane of glass (n =1.5). If the angle of incidence is 40.5 degrees, what is the angle of refraction?
n1 * sin(theta 1) = n2 * sin(theta 2)
= 26 degrees