Convex and concave mirrors have same radii of curvature R. The distance between the mirrors is 2R. At what point on the common optical axis of the mirrors should a point source of light A be placed for the rays to converge at the point A after being reflected first on the convex and then … Continue reading A Problem from Optics – Reflection of light

# Calculating charge on a body with excess of electrons

How would I calculate the charge on a small sphere with an excess of 5.0 x 10 14 electrons? Asked Kaitlin Thomas Answer: We know that charge on an electron is (-) 1.6 x 10-19 C If the sphere has 5.0 x 10 14 electrons in excess then the body has a net negative charge … Continue reading Calculating charge on a body with excess of electrons