How do you look in a concave mirror
Check out Figure 1 and the description of each part that follows. Centre C The centre shown in the diagram is where the centre of the sphere would be. Like a regular circle, the distance from the centre to the surface of the mirror is the radius. Focus or Focal Point F If an object was infinitely far away from the mirror, the light from it would converge on this one point. In the diagrams we are doing we will mostly be looking at how some light rays pass through or appear to pass through this focal point. The focal point is exactly in between the mirror and the centre.SEE VIDEO BY TOPIC: Concave Mirror Images - Characteristics - CBSE 10
SEE VIDEO BY TOPIC: Image formation by Concave MirrorContent:
Check out Figure 1 and the description of each part that follows. Centre C The centre shown in the diagram is where the centre of the sphere would be. Like a regular circle, the distance from the centre to the surface of the mirror is the radius. Focus or Focal Point F If an object was infinitely far away from the mirror, the light from it would converge on this one point. In the diagrams we are doing we will mostly be looking at how some light rays pass through or appear to pass through this focal point.
The focal point is exactly in between the mirror and the centre. Since the distance between the centre and the mirror is the radius, the distance from the focal point to the mirror is half of the radius. Principle Axis The blue line is the principle axis , a line that we will use as a reference point in our diagrams. It passes through the centre and is perpendicular to the surface of the mirror.
There are three rules you need to use to figure out where the image of the object will appear. You only need to use two to actually locate the image, but you can use the third as a check. Rule 1 : Any ray through the focal point will reflect parallel to the principle axis Figure 2. Light reflects off objects at all sorts of angles, and if it will help us to find where an image is, we might as well assume one ray goes right through the focus.
Rule 2: Any ray parallel to the principle axis will reflect so that it passes through the focal point. Figure 3. Notice the spot where I marked the red ray crossing the black ray from rule one … this shows me where the image will appear. Although we know where the image is, and that it is a real, inverted, smaller image, we can still confirm it using our last method….
Rule 3: Any ray that passes through the centre will reflect back through the centre. Unfortunately, this is the least reliable way to draw a ray, since small errors in the quick sketches we draw will become big errors. I had to assume that if the mirror was big enough it would have bounced back somewhere around there. Notice that it hits just about where the other two rays meet up.
Use Rule 2 because it works well for this mirror to draw the ray coming off of the tip of the object parallel to the principle axis as shown in Figure 7. When it hits the mirror, it bounces off so that a dotted line drawn behind the mirror will pass through the focal point. Rule 3 again, just because it works well for this mirror is used in Figure 8. This ray comes off of the tip of the object aiming straight for the centre.
Where it hits the mirror it will bounce back, but I draw a dotted line behind the mirror to show where the ray would have gone. Notice that there is now a place where the two dotted lines hit. This is where the image will appear. Same as above plus Example 1 : A convex mirror has a radius of 20 cm.
An object is placed 30 cm in front of the mirror. Determine where the image will appear. Example 2 : For the same situation from Example 1, determine how tall the image is if the object is 5.
Also determine the magnification. To calculate the magnification either distances or heights could be used. Since the distances have been through less calculations, I trust them more.
The magnification is positive, since the image is erect. But it less than one, so the image is smaller than the object Obviously these are not regular, plane mirrors. Imagine taking a giant ball and cutting a section out of it. You spray some shiny paint on the inside and outside and you have a curved mirror. The first kind we will be looking at is a concave mirror, which would mean that you made the inside of the ball shiny.
Then we will look at convex mirrors, where the outside of the ball was made shiny. Figure 1. Some textbooks label the object as "O" and the image as "I", as I have done in Figure 4.
The graphical method of locating the image produced by a concave mirror consists of drawing light-rays emanating from key points on the object, and finding where these rays are brought to a focus by the mirror. This task can be accomplished using just four simple rules: An incident ray which is parallel to the principal axis is reflected through the focus of the mirror. An incident ray which passes through the focus of the mirror is reflected parallel to the principal axis. An incident ray which passes through the centre of curvature of the mirror is reflected back along its own path since it is normally incident on the mirror.
A mirror is a reflective surface that does not allow the passage of light and instead bounces it off, thus producing an image. The most common mirrors are flat and called plane mirrors. These mirrors are made by putting a thin layer of silver nitrate or aluminium behind a flat piece of glass. When you place an object in front of a mirror, you see an image of the same object in the mirror.
Definition of Concave Mirror
Introduction Have you ever visited a house of mirrors and seen a wacky-looking version of yourself? In this activity you can construct your own miniature house of mirrors. Try it out and see what funny reflections you can make! Background We see an object when light reflected from the object shines into our eyes. From that input of light, the brain uses the eyes' signals to reconstruct a picture of the object. The brain makes a few assumptions in this process of reconstructing a picture. One assumption is that the light rays traveled in a straight line from the object to the eye. Although a light ray usually travels in a straight line, in some cases it can change direction first—for example, when a light ray enters or leaves a transparent material, such as water, or bounces off a shiny material, such as a mirror. Your brain still runs the usual reconstruction process, treating the image as if it were created by rays that travelled in a straight line.
Simple Uses of Concave Mirrors
Practical Activity for The concave mirror should be as large as possible and preferably have an aluminized front surface. Suitably sized mirrors are obtainable from the supplier: Ocean Direct. For the additional effect with a lamp, the aperture diameter across the mirror's face should be at least as big as the mirror's radius of curvature.
Concave and Convex Mirrors. Ray Diagram for Convex and Concave Mirror. A mirror is a part of a smooth and highly polished reflecting surface.
Concave and Convex Mirrors
Previously in Lesson 3, ray diagrams were constructed in order to determine the general location, size, orientation, and type of image formed by concave mirrors. Perhaps you noticed that there is a definite relationship between the image characteristics and the location where an object is placed in front of a concave mirror. We wish to describe the characteristics of the image for any given object location.SEE VIDEO BY TOPIC: Concave Mirror Demo
Light does not bend. A most significant property of light is that it travels in a straight line from its source to whatever surface it touches. The rays of light may be long or short; regardless, rays of light are always straight. A concave mirror is composed of a reflective surface with its sides curved closer in distance to your eye than its middle surface. When light travels through space, it eventually reaches a surface.
Image Characteristics for Concave Mirrors
Follow-up on this answer. Related Questions. Still Curious? Hi Pamela, You're probably familiar with a flat mirror, the most common household type of mirror. You see one of these every time you look into your bathroom mirror, or any time you notice your reflection in a window.
Concave mirrors are mirrors that curve inward. Used to focus light, they reflect it inward toward one focal point. Concave mirrors show different types of images, depending on the distance between the mirror and the object reflected. Concave mirrors are used quite frequently in day-to-day life.
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