CONVEX LENS

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PRESENTATION ON CONVEX LENS
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Types of Lenses
Lenses are used to focus light and form images.
There are two types of lenses, the concave and
the convex lens.
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ABOUT SPHERICAL LENS

• A transparent material bound by two surfaces, of
  which one or both surfaces are Spherical is
  called a spherical lens.
• Spherical lenses are of two types -
• CONVEX or CONVERGING LENS
• CONCAVE or DIVERGING LENS

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SOME TERMS USED IN LENS

• A line joining the centre of curvatures of two
  spherical surfaces forming a lens is called
  principal axis.
• The point on the principal axis through which the
  parallel rays of light to the principal axis
  goes undeviated from its path is called the
  optical centre.
• A point on the principal axis of a lens where all
  rays of light parallel to the principal axis
  converge at a point passing through the lens is
  called second principal focus of the lens
• A point on the principal axis of a lens so that
  the rays of light starting from this point after
  passing through the lens become parallel to the
  principal axis is called the first principal
  focus of the lens.
• The distance from the center of the lens to the
  focal point is called the focal length.

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SOME TERMS USED IN LENS

• The distance between the principal focus and
  optical centre of a
• lens is known as focal length of the lens.
• A beam of light may fall on either side of a
  lens. Therefore, a lens has two
  principal foci. They are donated by F1 and
  F2. Both principal foci are equidistant
  from the optical centre.
• The part of lens exposed to the incident light
  is called aperture of the lens .

• The distance from the center of the lens to the
  focal point is called the focal length.

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WHAT IS CONVEX LENS ?
A Convex Lens is a type of spherical lens
that converges the ray of light coming from the
object. It is thick at the centre and thin at
the edges. There are three types of convex
lenses - PLANO- CONVEX LENS
CONCAVO CONVEX LENS
DOUBLE-CONVEX LENS
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IMAGE FORMATION BY CONVEX LENS
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SL. NO POSITION OF THE OBJECT POSITION OF THE IMAGE SIZE AND NATURE OF THE IMAGE
1. At infinity At Focus,F2 Real, Inverted, Highly Reduced
2. Beyond 2F1 Between F2 And 2F2 Real ,inverted, Diminished
3. At 2F1 At 2F2 Real, inverted, Equal in size
4. Between F1 and 2F1 Beyond 2F2 Real, inverted, Enlarged
5. At F1 At infinity Real, inverted, Highly magnified
6. Between F1 and C Beyond F1on the same side as the object Virtual, erect, Enlarged
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OBJECT AT INFINITY
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When object is at infinity , the image is
formed at focus (f2).
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F1
F2
O
NATURE OF THE IMAGE Real , inverted , highly
diminished .
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WHEN OBJECT IS BEYOND 2F1
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When the object is beyond 2f1, the image is
formed between F2 and 2 F2 .
--------------------------------------------------
--------------------------------------------------
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F2
2F1
F1
2F2
O
Nature of the image Real, inverted,
smaller in size than the object .
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WHEN OBJECT IS AT 2F1
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When the object is AT 2f1, the image is formed AT
2F2 .
--------------------------------------------------
--------------------------------------------------
-------------------
2F2
2F1
O
F2
F1
Nature of the image Real, inverted, equal
in size of the object.
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WHEN OBJECT IS BETWEEN 2F1 AND F1
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WHEN OBJECT IS BETWEEN 2F1 AND F1, THE IMAGE IS
FORMED BEYOND 2F2 .
--------------------------------------------------
--------------------------------------------------
-------------------
F2
2F2
2F1
F1
O
Nature of the image Real, inverted,
enlarged.
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WHEN THE OBJECT IS AT F1
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WHEN OBJECT IS AT F1, THE IMAGE IS FORMED AT
INFINITY.
--------------------------------------------------
--------------------------------------------------
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2F2
2F1
F2
F1
O
Nature of the image Real, inverted, highly
magnified.
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WHEN THE OBJECT IS BETWEEN F1 AND OPTICAL CENTRE
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When the object is between O an F1 , the image is
formed beyond F1 on the same side of the lens as
the object is.
--------------------------------------------------
--------------------
--------------------------------------------------
--
--------------------------------------------------
--------------------------------------------------
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2F1
F1
F2
2F2
O
Nature of the image formed Virtual, erect,
magnified .
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APPLICATIONS OF CONVEX LENS

• Convex lens find a wide range of uses in our
  daily life
• It is used in astronomical telescopes to see
  the heavenly objects
• A convex lens of short focal lens is used in
  microscopes to see biological specimens
• It is also used in reading glasses
• It is used as a corrective lens for
  hypermetropia
• It also finds its use in cinematography

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• Designed By
• ABHISHEK SAHOO
• AKASH SAHA
• ASHUTOSH OJHA
• CHINMAYA SWAIN
• ABHINANDAN DAS
• ARYAMAN ABHISEKH

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THE END