what is the logic behind sign convection for spherical mirror ?
Kindly don't spam . I am not asking what is sign convection and its rule .
Answers
Answer:-
The main logic behind the sign convention is the cartesian plane. The sign convention works on the basis of cartesian. We know that, left side distance is indicated by negative or minus(-ve) sign where as distances on right side of kirrors or lenses are indicated by positive(+ve) sign. The same happens in the cartesian plane. The principle axis works as the x-axis and the half of the mirror works as y-axis. The distance below x-axis is always negative. Therefore, height of real images are always in negative and height of virtual images which are formed above the principle axis is always indicated with positive sign.
Conclusion:-
The main principle behind sign convection is the cartesian plane.
Answer:
Sign is taken as + (positive) behind the spherical mirror. For example if an image is formed behind the mirror, the distance of image is taken as + (positive) from pole along the principal axis.
The height of is taken as + (positive) above the principal axis and taken as – (negative) below the principal axis.
Sign is taken as – (negative) from pole of a spherical mirror towards object along the principal axis. This means sign is always taken as – (negative) in front of a spherical mirror. For example; the distance of object is always taken as – (negative) in case of both types of spherical mirror, i.e. concave and convex mirrors.