Explain the cartesian sign convention for mirrors.

Write the rules for sign convention.

What are the 'DeltaH' sign conventions for exothermic and endothermic reactions?

What are the sign conventions of the work done on the system and work done by the system?

What are the heat (q) sign conventions when heat is transferred from the surroundings to the system and that transferred from system to the surrounding?

A mobile phone lies along the principal axis of a concave mirror, as shown in Fig. 9.7. Show by suitable diagram, the formation of its image. Explain why the magnification is not uniform. Will the distortion of image depend on the location of the phone with respect to the mirror?