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Re: Optics B/C

Posted: April 3rd, 2018, 5:58 pm
by UTF-8 U+6211 U+662F
Restarting...

Explain the joke in a license plate that says "If this appears blue, you are going too fast."
Doppler effect. When you're moving towards an object (or it's moving towards you) the wavelengths become shorter (appear bluer)
Yeah, your turn

Re: Optics B/C

Posted: April 6th, 2018, 9:35 am
by Adi1008
Restarting...

Explain the joke in a license plate that says "If this appears blue, you are going too fast."
Doppler effect. When you're moving towards an object (or it's moving towards you) the wavelengths become shorter (appear bluer)
Yeah, your turn
A student is trying to estimate the wavelength of a laser using both a double slit experiment and a diffraction grating. Using the diffraction grating gives him a lower percent error. What are some reasons that using the diffraction grating might make the estimate of the laser's wavelength more accurate?

Re: Optics B/C

Posted: April 15th, 2018, 7:25 am
by UTF-8 U+6211 U+662F
A student is trying to estimate the wavelength of a laser using both a double slit experiment and a diffraction grating. Using the diffraction grating gives him a lower percent error. What are some reasons that using the diffraction grating might make the estimate of the laser's wavelength more accurate?
You can imagine a diffraction grating as being made up of many double slits. Thus, you get more constructive/destructive interference and less uncertainty.

Re: Optics B/C

Posted: April 24th, 2018, 2:37 pm
by UTF-8 U+6211 U+662F
Restarting this again... Describe the process of sight starting from a light ray to the sensory part of the brain.

Re: Optics B/C

Posted: April 24th, 2018, 7:01 pm
by Adi1008
A student is trying to estimate the wavelength of a laser using both a double slit experiment and a diffraction grating. Using the diffraction grating gives him a lower percent error. What are some reasons that using the diffraction grating might make the estimate of the laser's wavelength more accurate?
You can imagine a diffraction grating as being made up of many double slits. Thus, you get more constructive/destructive interference and less uncertainty.
Sorry for forgetting to respond T_T

You're correct! Here's a video that I thought explained it nicely in case anyone else is interested. Hyperphysics also has some cool stuff on this.
Restarting this again... Describe the process of sight starting from a light ray to the sensory part of the brain.
Light enters the eye by passing through the cornea, passing through the pupil. The lens is adjusted by the ciliary muscles through a process called accomodation to make sure that the light focuses on the retina. The light triggers photochemical reactions in rods and cones at the back of the retina. The chemical reactions activate bipolar cells, which in turn activate ganglion cells. All the axons of the ganglion cells converge to form the optic nerve. The optic nerve then takes the electrical signal to the thalamus, where it is routed to the visual cortex in the occipital lobe

Re: Optics B/C

Posted: April 24th, 2018, 7:23 pm
by UTF-8 U+6211 U+662F
Yep, your turn!

Re: Optics B/C

Posted: April 24th, 2018, 7:46 pm
by Adi1008
Yep, your turn!
A distant galaxy has a cosmological redshift (z) of 0.5.

(a) How quickly is it moving away from us (the observer), in meters per second?
(b) Light of wavelength 656.28 nm is emitted from that galaxy in its rest frame. At what wavelength do we observe that light as the observer?

It's a bit astronomy-themed, but I've seen questions like this come up on Optics tests before.