There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other...
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Transcript of There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other...
![Page 1: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/1.jpg)
![Page 2: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/2.jpg)
• There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.
![Page 3: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/3.jpg)
Curved Mirrors
![Page 4: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/4.jpg)
Curved Mirrors
• A curved mirror is a section of a sphere.
• If the outside surface of the sphere is reflecting, the mirror is convex.
• If the inside surface is reflecting, the mirror is concave.
![Page 5: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/5.jpg)
The characteristics (SALT) of the image formed can be:
• larger, smaller or the same size of the object
• inverted or upright
• in front or behind the mirror
• real or virtual
![Page 6: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/6.jpg)
Parts of the concave mirror:
• Vertex (V) – the centre of the mirror
• Principal Axis (PA) — line that goes through V
• Focus (F)—where the reflected rays of parallel incident rays intersect
• Centre of Curvature (C)—the centre of the sphere from which the mirror was cut
![Page 7: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/7.jpg)
![Page 8: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/8.jpg)
By drawing ray diagrams, you can find out how the image would be.
• Draw a ray parallel to the principal axis from the top of object to the curved mirror. After reflecting off mirror, the ray passes through the focal point.
![Page 9: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/9.jpg)
• Draw a ray from the top of the object through the focal point. The ray will be parallel to the optical axis after reflecting.
![Page 10: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/10.jpg)
• Draw a ray aimed at the vertex from the top of object to the curved mirror. After reflecting off mirror, the ray’s passes at the same angle below the principal axis.
![Page 11: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/11.jpg)
• Draw a ray aimed at the centre of curvature from the top of object to the curved mirror. After reflecting off mirror, the ray reflects back on itself.
![Page 12: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/12.jpg)
Use any two rules to determine the characteristics of the image.• Draw the image as a vertical arrow with its tail
on the principle axis and the head at the point where the two reflected rays meet.
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The characteristics (SALT) of the image formed are:
• smaller
• inverted
• in front of the mirror
• real
![Page 14: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/14.jpg)
http://www.edumedia-sciences.com/en/a308-concave-mirror
http://thinkingoutofthebeaker.ca/DigitalSci/CurvedMirrors.html
http://www.shermanlab.com/science/physics/optics/SphericalMirror.php
Useful Websites
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Practice your ray diagrams on the following. Draw the image. State the characteristics of each image.
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Answers
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Convex Mirrors
![Page 18: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/18.jpg)
Parts of the convex mirror:
• Vertex (V) – the centre of the mirror
• Principal Axis (PA) — line that goes through V
• Focus (F)—where the reflected rays of parallel incident rays intersect
• Centre of Curvature (C)—the centre of the sphere from which the mirror was cut
![Page 19: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/19.jpg)
By drawing ray diagrams, you can find out how the image would be.
• Draw ray parallel to principal axis. After reflection, this ray travels as if it is coming from the focus.
![Page 20: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/20.jpg)
• Draw line from top of object to centre, C. After reflection, this ray travels back on itself as if it is coming from the centre of curvature.
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• Draw line from top of object to the focus, F. After reflection, this ray travels back parallel to the principal axis.
![Page 22: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/22.jpg)
Use any two rules to determine the characteristics of the image. • The virtual image is drawn using a dotted line
with an arrow.Tip: Images formed by a convex mirror are always
smaller, upright, and virtual.
![Page 23: There are some mirrors that distort the reflected image. Cosmetic mirrors magnify things, and other mirrors make things look smaller.](https://reader035.fdocuments.net/reader035/viewer/2022062717/56649e485503460f94b3b9e0/html5/thumbnails/23.jpg)
Practice:
• Practice your ray diagrams on the following. Draw the image. State the characteristics of each image.