physics xf: concave lens
TRANSCRIPT
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CONCAVE LENSBy: Amelia, Ellen, Felix, Verencya
IMMANUEL CHRISTIAN SCHOOL
(SENIOR HIGH)
BILINGUAL CLASS
2012-2013
PHYSICS GRADE X
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LENZVS MIRRORZ Lenz R da OPPOSITE of mirrorz
They REFRACT da lightz, not REFLECT it. Henz,
lightz goes through lenz but in a ztate of refracted
instead of reflected like in mirrorz.
If a MIRROR iz a DIVERGENT, then da LENZ
counterpart iz CONVERGENT, n VICE VERSA.
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THINZINDAMIDDLEZ
THICKZINDAEDGEZ
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PICTURE
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DIFFERENCE
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What is Focal Length???
half a radius
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The incident beams that are parallel to the main axis arerefracted divergently, derived from the first focal point.
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The rays that come toward the other focal point arerefracted in a parallel fashion to the main axis
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The incident rays that pass through the center of thelens are transmitted without being refracted
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--------------------
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IMAGE FORMATIONZ
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IMAGE FORMATIONZ
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IMAGE FORMATIONZ
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CONCLUSIONZ
Smallerrr
UprightzVirtualz
ALWAYzZ.U CAN COUNT ON IT
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Before we proceed
What variables are there?
Objects distance and height Images distance and height
Magnification
Focal length and Radius
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Countingz
we can derive it into
where f and s2 is always negative
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Magnificationz
Equation:
When counting the magnifications value, any minus (negative) value is
negated.
Magnification affects the size of the objects image after being reflectedor refracted.
Magnification can be bigger or smaller than its
original size. If its bigger, we call it magnified. If
its smaller, we call it diminished.
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EXAMPLE 2
A glass is put 5 cm in front of a concave lens with a
focal length of 20 cm. Calculate the image distance
from the lens and its magnification.
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GREATER = CLOSER image
THE OPTICAL POWER OF LENS ARE DEFINED AS:
P = 1/F
Where F = Focal Length (in Meters(m))
And P = Optical Power of Lens (in Dioptre(D))
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An object is placed 12 cm in front of a
lens and generates image of 3 cm in
size. Find the optical power of lens!
EXAMPLE 1
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A myopia sufferer wears glasses with
focal length of 40cm. In order to be
able to see objects clearly, what is
the power of lens of the glasses?
EXAMPLE 2
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USES
Glasses for Myopia
Telescope
Camera
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How is the image formation in concave
lens?
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Mention 3 uses of concave lens!
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Mention 2 differences between
mirror and lens!
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Draw the three beams of concave
lens!
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fighT!
An object of 6 cm is placed 10 cm in front of a concave lens with a focal
length of 30 cm.
Find:
A. The Distance of the Image from the Lens
B. The Magnification
C. The Image Height
D. The Optical Power Of Lens
E. Draw the Ray Diagram
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THANK YOU