100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Summary LAB NOTES: WEEK 3 OF PHYSICS 3LC AT UCI $5.49
Add to cart
Quickly navigate to
Preview
  2.  
  3. University Of California - Irvine
  4.  
  5. Basic Physics Laboratory (PHYSICS3LC)

Summary

Summary LAB NOTES: WEEK 3 OF PHYSICS 3LC AT UCI
 0 purchase

Typed notes covering Physics Lab (3LC) week 3 lab theory and experiment. Contains notes corresponding to lab sections 3.1.1 - 3.1.4 and labeled diagrams.

Preview 2 out of 6  pages

Document information

  • August 13, 2024
  • 6
  • 2019/2020
  • Summary

Subjects

Written for

All documents for this subject (17)

Seller

avatar-seller
PrinceAlixD

Content preview

Wk3: Reflection Abbreviations:
b/w = between
Tuesday, October 20, 2020 6:38 PM
w/ = with
V = voltage
I = current
D = displacement
Section 3.1.1: Reflection R = resistance


• Reflector: an object that reflects light that falls upon it. 3.3.3:
• Compass is 6 degrees initially, parallel to the white card. = mirror
• White card is perpendicular initially; laser hits card, and passes beam to photometer.
○ Smooth surface -> specular reflector 3.3.4:
• With 2 loops: increase the amount of light going in.
○ Rough surface -> diffuse reflector

Lab Report Notes
(N, perpendicular to the mirror)
Incident ray
• (3.2.2) Verify θmirror = ½θbench or equivalently θi = θr. θbench (=i) and θmirror (=i+r)


are defined in Fig. 3.7.
•



Point of incidence




○ Reflection of a light ray from a specular surface.
IN THEORY When light rays are shined on a mirror, the incident ray creates an angle

○ Angle of incidence i: angle b/w the incidence ray and the normal line N,
where the angle of incidence (i) is equal to the angle of reflection (r), suggesting that the

perpendicular to the mirror.
θmirror is half of θbench.

○ angle of reflection r: angle b/w the normal line N and the reflected ray.
• Show calculations for the discrepancy for one of the trials, say trial #1. Discrepancy= (T-

• Laws of reflection for specular reflectors:
E)/T*100 Trial 1: (25-24)/25*100= 4.000% There is a 4.000% discrepancy between

○ i = r.
the theoretical and experimental θmirror.

○ The incident ray, the normal, and the reflected ray all lie in the same plane.
• You do not need to estimate the errors, but state and explain which of the two methods

• ^Smooth surface allows for the formation of the objects placed before them, on the other
(compass reading vs. distance measurement) is more accurate. In general, distance

hand…
measurement gives way to more significant figures, suggesting that using a meter


stick is more accurate than reading a compass. For example, in trial #2 θbench using

, • Diffuse reflectors have a reflected beam that is scattered bc of the unevenness of the the meter stick is 29.72degrees with an uncertainty of 0.01; θbench using the compass

surface. -> NO formation of an image. is 30degree with a greater uncertainty of 1.


3.1.2: Refraction • Can you conclude from your results whether the mirror is a perfect specular reflector and


• Refraction: bending of light at the interface of 2 media, as the light ray goes from one why? At a 50degree angle, there is a 4% discrepancy between the theoretical θmirror


medium to another. Ex. Placing a pencil in a glass of water at a bent angle. and the experimental θmirror. Since the discrepancy is below 5%, we can assume


• Index of refraction n = c/v that θmirror is equal to half of θbench (in theory). This suggests that the angle of


○ In any medium other than a vacuum (c=3.00*10^8m/s), light travels slower at the incidence (i) is equal to the angle of reflection (r), where both angles ADD UP to


speed v. θmirror. Since the mirror follows the law of reflection for specular reflectors (i=r),


• If light travels from a rarer to a denser medium (nrare < ndense), then it bends toward the we can conclude that the mirror is a perfect specular reflector.


normal. However, • (3.3.3) Measure how the amount of light reflected by a diffuse reflector varies with the


• If light travels from a denser to a rarer medium (nrare < ndense), then it bends away from the angle of reflection.


• What is the angle θcompass when the white card is parallel to the optical bench? The
normal.

compass is 6 degrees initially when the white card is parallel to the optical bench.


• Calculate the expected θmirror for the expected intensity maximum corresponding to
•
specular reflection. 360 + 6 = 366 - (90-25) = 301degrees. Have to take into account


compass offset of 6 degrees. Reference frame is normal line N 90degrees—where

• Law of refraction: maximum intensity is expected if laser is pointed head-on to the mirror. Angle of

○ The incident ray, the normal, and the reflected ray all lie in the same plane. incidence (i) = expected θmirror = 25degrees

○ The ratio of the angle of incidence i in the 1st medium to the angle of refraction r in • Calculate the discrepancy between the expected angle and the angle given in the data.

the second medium is related to the ratio of the indexes. -> Theoretical θmirror: 301degrees, Experimental θmirror (at maximum intensity):

○ Snell's law of refraction: Ni*sini = nr*sinr 304degrees -> |(301-304)|/301 * 100 = 0.9967%


3.1.3: Total internal reflection • Is the white card an ideal diffuse reflector? Considering there is less than 5%


• Rarer->denser: discrepancy between the theoretical and experimental θmirror at maximum

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller PrinceAlixD. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $5.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

67479 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling
$5.49
  • (0)
Add to cart
Added