9th. Images obtained by a spherical mirror. 🎷

 

9th. Sci. Images obtained by a spherical mirror. 🎷

Chapter:- Reflection of Light
 In this topic today w will look at the images obtained by a spherical mirror.
In the previous topic, we have seen three rules based on the law of reflection of light for drawing ray diagrams.
Images formed by a concave mirror let us see the first figure
1. When an object is placed at an infinite distance it means at a very large distance from a concave mirror.

The image is formed at principal focus F. The nature of the image is inverted and real. The size of the image is pointed image.
2. When the position of the object is beyond the center of curvature C 

at that time the images formed between the center of curvature C and focus F. The nature of the image is inverted and real. The size of the image is diminished / smaller than the object.
3. When the position of the object is at the center of curvature C

 at that time the position of the image is at the center of curvature C in such a situation the nature of the image is inverted and real. The size of the image is the same as the object.
4. Position of the object:- Between focus F and center of curvature C




at that time the image is beyond the center of the curvature C. The nature of the image is inverted and real. The size of the image is magnified / larger than the object.
5. When an object is placed at the focus F

its image is at infinity at that time the nature of the image is inverted and real. The size of the image is very large which cannot be taken on screen.
6. When an object is placed between the pole P and focus F

 at that time its image is behind the mirror. The nature of the image is erect and virtual. The size of the image is magnified.
Some useful tips, to remember easily 🎷
Show your figures to your teacher because we can't understand our mistakes own.
When drawing a ray diagram, the pencil should be pointed, so that a single straight line can be drawn. There should not be a line on one,(Overwrite) (ex. fig.4 it's not good) there should not be a dent, avoid rubber work.
As we move from infinity to the mirror, the size of the object should decrease as the size of the image increases, so it is convenient to draw the figure properly.
 The following diagram will be useful for studying easily the images formed by objects when they are placed in front of a concave mirror.


You can study six images at the same time. As the object moves towards the mirror, the image moves away from the mirror. But the exception to this is the sixth figure.
 Practice by drawing diagrams yourself..... Use Scale and pencil properly. The distance between principal focus F and center of curvature C should be measured.
 The virtual image should be drawn by a dotted line. Draw the line only with the help of a good scale.