While using an electric bulb, the reflection for street lighting should be from

Which object use the reflection of light?

In an electric bulb, light is produced due to the glowing of

An air core coil and an electric bulb are connected in series with an AC source. If an iron rod is put in the coil, then the intensity of light of the bulb will

An air core coil and an electric bulb are connected in series with an AC source. If an iron rod is put in the coil, then the intensity of light of the bulb will

Concave reflectors are used in street lights. ____