Lab
Index of Refraction: Glass
Printer Friendly Version
Purpose:
To use ray sightings to calculate the index of refraction of glass.
Equipment:
7 cm x 7 xm glass square
ruler
cardboard
protractor
yellow data paper
2 straight pins
Set-up:
Procedure:
Place the yellow paper on the cardboard.
Place the glass plate in the center of the yellow paper and trace its outline in pencil.
Place the straight pins into the paper along a slanted line between 2 to 5 cm from the top of the glass.
Sight the base of the pins through the glass until the edge of the ruler "appears" to line up with the pins.
Using a ruler, sketch this line on your paper.
Remove the glass and connect this sight line to the lower edge of the glass outline.
Next draw the line that connects the two stright lins to the top edge of the glass outline.
Connect the point where the line from the pins on the top edge of the glass outline to the point where the line draw along the edge of the ruler hits the bottom of the glass outline.
Measurements:
Using your protractor, measure all four angles: the angle of incidence and the angle of refraction at the top interface and the angle of incidence and the angle of refraction at the bottom interface. Label your diagram and then place your answers in the data table provided. Next use
Snell's Law
to calculate the experimental index of refraction for glass based on the angle data for each interface.
n
_{glass}
sin(θ
_{glass }
) = n
_{air}
sin(θ
_{air }
)
since n
_{air}
= 1.0
n
_{glass}
= sin(θ
_{air }
)/sin(θ
_{glass }
)
Data Table
top
interface
bottom
interface
air
glass
experimental index
Measure in cm the length of the path followed by the light through the glass plate.
Analysis and Conclusions
What is the average of your two experimental values for the index of refraction of glass?
What was the percent difference between your two experimental values for the index of glass?
Calculate the average speed of light (in m/sec) through glass using your average experimental index of refraction.
Calculate the time required for the light to pass through the glass plate.
On your papers, in addition to labelling your angles, color the ray from the pins in color #1 and the normal and glass plate in color #2. Remember to place arrows on each ray showing that the light originated at each pin and traveled through the glass to your eye.
Related Documents
Lab:
Labs -
A Simple Microscope
Labs -
Blank Ray Diagrams for Converging Lenses
Labs -
Blank Ray Diagrams for Converging, Concave, Mirrors
Labs -
Blank Ray Diagrams for Diverging Lenses
Labs -
Blank Ray Diagrams for Diverging, Convex, Mirrors
Labs -
Determining the Focal Length of a Converging Lens
Labs -
Index of Refraction: Water
Labs -
Least Time Activity
Labs -
Man and the Mirror
Labs -
Man and the Mirror: Sample Ray Diagram
Labs -
Ray Diagrams for Converging Lenses
Labs -
Ray Diagrams for Converging Mirrors
Labs -
Ray Diagrams for Diverging Lenses
Labs -
Ray Diagrams for Diverging Mirrors
Labs -
Reflections of a Triangle
Labs -
Spherical Mirror Lab
Labs -
Student Lens Lab
Labs -
Target Practice - Revised
Resource Lesson:
RL -
A Derivation of Snell's Law
RL -
Converging Lens Examples
RL -
Converging Lenses
RL -
Demonstration: Infinite Images
RL -
Demonstration: Real Images
RL -
Demonstration: Virtual Images
RL -
Dispersion
RL -
Diverging Lenses
RL -
Double Lens Systems
RL -
Lensmaker Equation
RL -
Mirror Equation
RL -
Properties of Plane Mirrors
RL -
Refraction of Light
RL -
Refraction Phenomena
RL -
Snell's Law
RL -
Snell's Law: Derivation
RL -
Spherical Mirrors
RL -
Thin Lens Equation
Review:
REV -
Drill: Reflection and Mirrors
REV -
Mirror Properties
REV -
Physics I Honors: 2nd 9-week notebook
REV -
Physics I: 2nd 9-week notebook
REV -
Spherical Lens Properties
Worksheet:
APP -
Enlightened
APP -
Reflections
APP -
The Librarian
APP -
The Starlet
CP -
Lenses
CP -
Plane Mirror Reflections
CP -
Refraction of Light
CP -
Snell's Law
CP -
Snell's Law
NT -
Image Distances
NT -
Laser Fishing
NT -
Mirror Height
NT -
Mirror Length
NT -
Reflection
NT -
Underwater Vision
WS -
An Extension of Snell's Law
WS -
Basic Principles of Refraction
WS -
Converging Lens Vocabulary
WS -
Diverging Lens Vocabulary
WS -
Lensmaker Equation
WS -
Plane Mirror Reflections
WS -
Refraction and Critical Angles
WS -
Refraction Phenomena
WS -
Refraction Through a Circular Disk
WS -
Refraction Through a Glass Plate
WS -
Refraction Through a Triangle
WS -
Snell's Law Calculations
WS -
Spherical Mirror Equation #1
WS -
Spherical Mirror Equation #2
WS -
Spherical Mirrors: Image Patterns
WS -
Thin Lens Equation #1: Converging Lenses
WS -
Thin Lens Equation #2: Converging Lenses
WS -
Thin Lens Equation #3: Both Types
WS -
Thin Lens Equation #4: Both Types
WS -
Two-Lens Worksheet
WS -
Two-Mirror Worksheet
TB -
27B: Properties of Light and Refraction
TB -
Refraction Phenomena Reading Questions
PhysicsLAB
Copyright © 1997-2014
Catharine H. Colwell
All rights reserved.
Application Programmer
Mark Acton