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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




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Page 2

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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…

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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…

Page 4

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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…

Page 5

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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…

Page 6

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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




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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…

Page 8

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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…

Page 9

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Results


real depth/cm apparent depth/cm real depth
n=
apparent depth




Average n =




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Page 10

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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…

Comments

Symthiya

Very useful indeed....

rabika

where the notes for IAL Physics Unit-6??

rabika

*are

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