PHYSICS XF: Camera & Magnifier
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Transcript of PHYSICS XF: Camera & Magnifier
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OPTICAL
INSTRUMENTS
By: Cynthia Meylinda Kevin - Rendy
CAMERA & MAGNIFYING GLASS
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MAGNIFYING GLASS
Magnifying glass is a convex lens thatis used to produce a magnifiedimage of anobject.The lens is usually mounted in
a frame with a handle
http://en.wikipedia.org/wiki/Lens_(optics)http://en.wikipedia.org/wiki/Magnificationhttp://en.wikipedia.org/wiki/Imagehttp://en.wikipedia.org/wiki/Lens_(optics)http://en.wikipedia.org/wiki/Lens_(optics)http://en.wikipedia.org/wiki/Imagehttp://en.wikipedia.org/wiki/Magnificationhttp://en.wikipedia.org/wiki/Lens_(optics) -
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MAGNIF
YIN
G
GLASS
HISTORY
Roger Bacon
Lecturer
(University of Oxford)
Did various experiments
& described the
principles of reflectionand refraction
1250
His research was oriented by the legacy of
Alhazen
Made a start for microscopes, telescope
and spectacles invention
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MAGNIF
YIN
G
GLASS
CONCEPT
DOUBLE CONVEX LENS
The properties of image :
VIRTUALUPRIGHT
ENLARGED
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MAGNIF
YIN
G
GLASS
CONCEPT
OBJECTIVE LENSOCULAR LENS
foc > fob
fob > foc
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MAGNIF
YIN
G
GLASS
HOW IT WORKS?
f f 2f2f
Note : The image will be formed smaller if
its placed in the 3rd room.
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MAGNIF
YIN
G
GLASS
CALCULATION
Maximum Accommodation :
No Accommodation :
Accommodates in certain distance :
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MAGNIFYING
GLASS
CALCULATION
Sn = 25 cm
o
sh
25cm
Maximum Accommodatio
No Accommodation
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MAGNIFYING
GLASS
CALCULATIONMaximum Accommodation :
=
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MAGNIFYING
GLASS
CALCULATIONNo Accommodation :
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CALCULATION
Jessica reads a book using a magnifying glass with afocal point 2 cm and the near point of the eye known
is 25 cm.
Calculate the magnification of the object, on/if:
a. Maximum Accommodation
b. No Accommodation
c. Accommodate in 10cm distance
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CALCULATION
Known :- Focal point (f) = 2cm
-Sn = 25cm
Asked :
a) Max acc => M = 25cm
b) No acc => M = 25cm
c) 10cm acc => M = 25cm 25cm
2cm+ 1 = 13.5 x
2cm
= 12.5 x
2cm+
10cm= 15 x
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CALCULATION OPTICAL POWER OF LENS
dioptre / diopter
Andrehansen is using a microscope with a power
of lens 12.5 dioptre, an the nearest is 25cm. What
is the distance of the focus lens? The magnification
when the eyes accomodate maximumly? The
magnification when the eyes dont accomodate?
a)
b)
c)
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Camera is a device that
records images that can be stored directly,
transmitted to another location, or both.These images may be still
photographs or moving images such
as videos ormovies
C A M E R A
http://en.wikipedia.org/wiki/Imagehttp://en.wikipedia.org/wiki/Photographhttp://en.wikipedia.org/wiki/Videohttp://en.wikipedia.org/wiki/Movieshttp://en.wikipedia.org/wiki/Movieshttp://en.wikipedia.org/wiki/Videohttp://en.wikipedia.org/wiki/Photographhttp://en.wikipedia.org/wiki/Image -
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HISTORY
CAMER
A
1814
Joseph Nicphore Nipce
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CAMER
A
HISTORY
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HISTORY
CAMER
A
Jacques Mand Daguerre
Daguerreotype Camera
1837
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CAMER
A
Daguerreotype Camera Works
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CAMER
A
HISTORY
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HISTORY
CAMER
A
William Henry Talbot
1841Calotype
HISTORY
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HISTORY
CAMER
A
1888
Eastman
Kodak roll film camera
HISTORY
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HISTORY
CAMER
A
HISTORY
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HISTORY
CAMER
A
Edwin Land
1948
HISTORY
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HISTORY
CAMER
A
HISTORY
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HISTORY
CAMER
A
1963Polaroid releases instant colour film.
1973
Polaroid develops one step instant colourfilm,shoot and print with one click.
1978Konica invents the point and shoot auto
focus camera
PARTS OF CAMERA
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PARTS OF CAMERA
CAMER
A
LENS
PENTAPRISM
MIRROR
SHUTTER
VIEWFINDER
APERTURE
FLASH
HOW IT WORKS?
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HOW IT WORKS?
CAMER
A
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TYPES
CAMER
A
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CALCULATION
CAMER
A
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CALCULATION
CAMER
A
Hansen bought old an SLR camera with a focal length of 80mm.
Hansen wants to take a picture of Meiga Tok who is 2m away
from the camera. Calculate:
a) The distance of the lens to the film so that the image of
Meiga Tok can be formed in the film.
b) The magnification.
a) Known:
f = 80mm
S = 2m = 2000mm
si = 83.3mm
b) Magnification
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