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Refraction Lab

The document outlines a laboratory experiment aimed at investigating the relationship between the angle of incidence and angles of refraction for glass. It details the apparatus, procedure, results, analysis, and conclusion of the experiment. The results include a table of angles and a method for calculating the refractive index (n) from both a graph and a table.

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23 views2 pages

Refraction Lab

The document outlines a laboratory experiment aimed at investigating the relationship between the angle of incidence and angles of refraction for glass. It details the apparatus, procedure, results, analysis, and conclusion of the experiment. The results include a table of angles and a method for calculating the refractive index (n) from both a graph and a table.

Uploaded by

hailtotheking
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Lab #

Date:
Title: Light refraction
Aim: To investigate the relationship between the angle of incidence and the
corresponding angles of refraction for glass
Apparatus: paper, protractor, ruler, glass block, optical pin (four), optical board, sharp pencil
tacks (two)
Diagram of setup:

Procedure:

1. The paper was tacked onto the optical board. The glass block was placed in
the center of the paper and the outline of the glass block was drawn in pencil.
2. The protractor was used to draw a normal on the middle of the long side of the
block. The intersection of the normal was labelled on the glass as point O.
3. The protractor was used to measure out and draw in angles of incidence, i, 10°, 20°,
30° up to 60°.
The lines were extended to the edge of the paper.
4. On the 10° line, two pins A and B were placed upright so that A is as close to
the block as possible and B is as close to the edge of the paper as possible.
5. The images of A and B were looked through the glass block, the head was
turned in the position where the B image is directly behind the A image. A pin C
was placed as close to the block so that it appears to be in line with images of A and B.
6. A forth pin D was placed close to the edge of the page so that it is in line with C and the
images of A and B.
7. The pins were removed and were placed over the holes for pins C and D
that have the correct alignment. The block was removed as well.
8. A line was drawn through the pinholes and was extended back to the glass
block (point R). This represents the emergent ray.
9. The refracted ray was drawn in by connecting point O to point R. Arrows were
drawn on the incident and emergent ray to indicate direction in which the light
travels. The protractor was used to measure the angle of refraction, r, and r was
recorded and its corresponding angle of incidence, i.
10. The procedure was repeated for all the angles of incidence drawn.
11. Results were tabulated.

Results:

TABLE SHOWING AGLES OF INCIDENCE AND REFLECTION FOR GLASS BLOCK


Angle of incidence 10° 20° 30° 40° 50° 60°
Angle of refraction
Sin i
Sin r
sin i
n=
sin r

calculate n from graph (gradient)

calculate n from table (average n)

Analysis:

1. Complete table
2. Plot graph of sin i against sin r.
3. Find n from table analysis.
4. Find n from graph analysis
5. Which n is better to use and why?
6. What does n represent?
7. Which law gives n ratio
1
8. Find the cirtical angle of glass. Use sinC =
n
9. Find the value of the angle of incidence when the angle of refraction is 25°.

Discussion:

Conclusion:

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