Optics finding index of refraction

Click For Summary
SUMMARY

The discussion focuses on determining the refractive index of a transparent glass plate using a microscope. The key data includes a barrel position change of 1.87mm and a plate thickness of 1.5mm. The relevant equation for this calculation is nglass/nair = y/y', where nglass represents the refractive index of the glass and nair is the refractive index of air. The second image observed is due to the refraction of light as it passes through the glass, causing a shift in the focal point.

PREREQUISITES
  • Understanding of optics principles, particularly refraction.
  • Familiarity with the concept of refractive index.
  • Basic knowledge of microscope operation and measurements.
  • Ability to manipulate and apply equations related to optics.
NEXT STEPS
  • Study the derivation and application of the equation nglass/nair = y/y' in optics.
  • Research the principles of light refraction and its effects on image formation.
  • Learn about the use of microscopes in optical measurements and experiments.
  • Explore practical examples of calculating refractive indices in various materials.
USEFUL FOR

Students in physics or optics courses, educators teaching optics concepts, and anyone involved in experimental physics or optical measurements.

Liquidxlax
Messages
312
Reaction score
0

Homework Statement



4gk1A.jpg


In order to determine the refractive index of a transparent plate of glass, a microscope is first focussed on a tiny scratch on the upper surface and the barrel position is recorded. Upon further lowering the microscope barrel by 1.87mm , a focussed image of the scratch is seen again. The plate thickness is 1.5mm. What is the reason for the second image and what is the refractive index of the glass?

Homework Equations



nglass/nair = y/y'

The Attempt at a Solution



i know the reason for the second image, my problem is I'm not sure what to do with the data given, because all that I've tried my answers are too high or to low. I'm also not sure if that equation is relevant, or what to use. I've read my text a few times, and i see nothing that even relates to this problem.
 
Physics news on Phys.org
does anyone have an idea?
 

Similar threads

Light incident on a sphere, focused at a distance ##2R##
  • · Replies 2 ·
Replies
2
Views
2K
The refractive index of an unknown liquid
  • · Replies 1 ·
Replies
1
Views
3K
Find the refractive index for the lens and find the image distance
  • · Replies 3 ·
Replies
3
Views
2K
Mirror: refractive index and thickness
  • · Replies 1 ·
Replies
1
Views
3K
How do I find the refractive index in sugar solutions?
  • · Replies 13 ·
Replies
13
Views
4K
How to find unknown refractive index to solve for theta
  • · Replies 11 ·
Replies
11
Views
3K
Optics: refraction and reflection
  • · Replies 1 ·
Replies
1
Views
2K
Calculate the focal distance of the duplicate
  • · Replies 3 ·
Replies
3
Views
2K
Calculating Index of Refraction with Wavelength
  • · Replies 1 ·
Replies
1
Views
2K
A problem involving thin film interference
  • · Replies 2 ·
Replies
2
Views
2K