AS physics unit 3 revision notes (prt 2 - light experiments)

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PHYSICS
EXPERIMENTS
(LIGHT)
`In the matter of physics, the first lessons should contain
nothing but what is experimental and interesting to see. A
pretty experiment is in itself often more valuable than twenty
formulae extracted from our minds.' - Albert Einstein
www.psi-net.org
1

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LEAVING CERTIFICATE PHYSICS
LISTED EXPERIMENTS
CONTENTS
LIGHT
Measurement of the focal length of a concave mirror ...................................................... 4
Verification of Snell's law of refraction............................................................................. 6
Measurement of the refractive index of a liquid................................................................ 8
Measurement of the focal length of a converging lens ................................................... 10
Measurement of the wavelength of monochromatic light............................................... 12
(using the laser) ..................…read more

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NOTE
For examination purposes any valid method will be acceptable for describing a particular
experiment unless the syllabus specifies a particular method in a given case.
Students will be expected to give details of equipment used, assembly of equipment, data
collection, data manipulation including graphs where relevant. Students will also be
expected to know the conclusion or result of an experiment and appropriate precautions.
SAFETY
1.…read more

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MEASUREMENT OF THE FOCAL LENGTH OF A CONCAVE
MIRROR
Apparatus
Concave mirror, screen, lamp-box with crosswire.
Concave Crosswire
mirror
Lamp-box
Screen
u
v
Procedure
1. Place the lamp-box well outside the approximate focal length - see notes.
2. Move the screen until a clear inverted image of the crosswire is obtained.
3. Measure the distance u from the crosswire to the mirror, using the metre stick.
4. Measure the distance v from the screen to the mirror.
1 1 1
5.…read more

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Results
u/cm 1 v/cm 1 1 f/cm
/cm-1 /cm-1 /cm-1
u v f
Average f =
Notes
The approximate method for finding the focal length is recommended as a starting point
for this experiment. The approximate method is described in the Appendix.
A microscope lamp makes a very suitable strong light source. Cover the glass of the lamp
with a piece of tracing paper. Use `peel-and-stick' letters to create an `object' on the
tracing paper.…read more

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VERIFICATION OF SNELL'S LAW OF REFRACTION
Apparatus
Glass block, lamp-box, 0-3600 protractor, (photocopied from page 56 of Physics A
Teacher's Handbook)
Lamp-box
0 - 360° Protractor
i
Glass Block
A
B
r
C
6…read more

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Procedure
1. Place a glass block on the 0-3600 protractor in the position shown on the diagram
and mark its outline.
2. Shine a ray of light from a lamp-box at a specified angle to the near side of the
block and note the angle of incidence.
3. Observe the ray of light leaving the glass block and similarly mark the exact point
B where it leaves the glass block.
4. Remove the glass block. Join BA and extend to C.
5.…read more

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MEASUREMENT OF THE REFRACTIVE INDEX OF A LIQUID
Apparatus
Plane mirror, two pins, cork, retort stand, large containers.
Cork
Pin
Apparent
depth
Mirror
Real
depth
Water
Image
Pin
Procedure
1. Fill a container to the top with water.
2. Place the plane mirror to one side on top of the container.
3. Put a pin on the bottom of the container.
4.…read more

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Results
real depth/cm apparent depth/cm real depth
n=
apparent depth
Average n =
9…read more

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MEASUREMENT OF THE FOCAL LENGTH OF A CONVERGING
LENS
Apparatus
Converging lens, screen, lamp-box with crosswire, metre stick, retort stand.
Lamp-box with crosswire Lens Screen
.
u v
Procedure
1. Place the lamp-box well outside the approximate focal length ­ see notes.
2. Move the screen until a clear inverted image of the crosswire is obtained.
3. Measure the distance u from the crosswire to the lens, using the metre stick.
4. Measure the distance v from the screen to the lens.…read more

Comments

Symthiya

Very useful indeed....

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