What are the advantages of using discharge lamps instead of incandescent lamps ?

What are the advantages of using tungsten as a filament ?

What are the advantages of fluroscent lamps over incandescent lamps.

High precision optical instruments uses prisms instead of mirror to reflect light What is the advantage of using prism instead of mirror for reflecting light ?

Incandescent lamp, discharge lamp , C.F.L, LED lamp, arc lamp are given for observation . Answer the following questions after observing them. Which metal is used to make filament of an incandescent lamp ? What are the advantages of using this metal as a filament ?

Observe the diagram . Nichrome is not used as filament in incandescent lamps . Why ?

Nichrome is not used as filament in incandascent lamp . Why ?

What will be the change if silver rod is used instead of iron rod? What is the reason?