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Physics First Course
Physics First Course
One Chapter 1
Two Chapter 1
Three Chapter 1
Four Chapter 1
Practice Question Chapter 1
Assignment Chapter 1
One Chapter 2
Two Chapter 2
Three Chapter 2
Four Chapter 2
Five Chapter 2
Six Chapter 2
Practice Questions Chapter 2
Assignment Chapter 2
One Chapter 3
Two Chapter 3
Vector Addition
Three Chapter 3
Four Chapter 3
Five Chapter 3
Practice Questions Chapter 3
Assignment Chapter 3
One Chapter 4
Two Chapter 4
Practice Question Chapter 4
One Chapter 5
Two Chapter 5
Three Chapter 5
Four Chapter 5
Circular Motion
Practice questions Chapter 5
Assignment Chapters 4 and 5
One Chapter 6
Two Chapter 6
Three Chapter 6
Practice Questions Chapter 6
Assignment Chapter 6
One Chapter 7
Two Chapter 7
Three Chapter 7
Practice Questions Chapter 7
One Chapter 8
Two Chapter 8
Three Chapter 8
Practice Questions Chapter 8
Assignment Chapters 7 and 8
One Chapter 9
Two Chapter 9
Practice Questions Chapter 9
One Chapter 10
Two Chapter 10
Three Chapter 10
Four Chapter 10
Practice Questions Chapter 10
Assignment Chapters 9 and 10
One Chapter 11
Two Chapter 11
Three Chapter 11
Four Chapter 11
Five Chapter 11
Six Chapter 11
Practice Questions Chapter 11
One Chapter 12
Two Chapter 12
Three Chapter 12
Four Chapter 12
Five Chapter 12
Practice Questions Chapter 12
Assignment Chapters 11 and 12
Practice Question Answers
Physics First Course
Six Chapter 11
Some Applications of Lenses
Used in projectors
The condenser ensures uniform illumination of the slide or movie.
The converging mirror and light illuminate the slide or movie
The slide is placed between one and two focal lengths from the projector lens so that a large real image is produced.
The image is upside down; therefore, the slide or movie film must be placed in the projector upside down.
The projection lens is in a tube so it can be moved back and forth to focus the image.
Used in microscopes
The simple microscope is just a magnifying glass with the object placed inside the focus. This produces a virtual image.
The compound microscope uses two lenses arranged as in the diagram below.
The objective produces an enlarged inverted real image
The image is inside the focus of the eyepiece and acts as the object for the eyepiece.
The eyepiece then produces an enlarged erect virtual image.
Focus is achieved by mounting the eyepiece in a tube that can be moved back and forth.
Used in telescopes
Astronomical telescopes
– has two converging lenses
Light from a distant object is nearly parallel and forms a real inverted image near the focal point of the objective.
This image is just inside the principal focus of the eyepiece.
The eyepiece acts like a magnifying glass producing an inverted virtual large image.
Terrestrial telescopes
– have a third lens between the objective and eyepiece.
The purpose of the third lens is to make an erect image.
Prism binoculars
– consists of two refracting telescopes mounted side by side.
Between the objective and the eyepiece is a pair of prisms. These invert the image to make it erect.
The prisms also reduce the distance between the two lenses and make the device smaller
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November 21, 2013
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