Aconcave lens can only form a a. real image. b. reversed image. c. virtual image. d. magnified image. in my book it says concave makes a real image and convex makes a virtual image can someone explain to me why this one isnt a.,

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge

Which lists the amplitudes of sound waves from these sources in order from greatest to least? busy roadway, kids whispering, average home chainsaw, diesel truck, rustling leaves kids whispering, vacuum cleaner, jet airplane library, conversational speech, music from speaker

A15 ohm resistor and a 25 ohm resistor are connected in a series to a 60 volt battery. what is the power used by each device