What is the image distance of an object placed at a distance of 2f from a converging lens of focal length f?

If an ebonite rod is rubbed with fur?

A. both the ebonite rod and the fur will be negatively charged B. the ebonite rod will be positively charged while the fur will have no charge C. there will be electron transfer only if the ebonite rod is earthed D. the ebonite rod will be negatively charged while the...

Copyright warnings! Do not copy.