When electrical energy converts into light energy in bulb then some energy is wasted as in the form of heat. So How law of conservation of energy is valid in this case

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Solution

Electrical Energy=Light Energy+Heat Energy.
It does not matter whether you are able to use the heat energy or not the energy is conserved. The heat energy and the both energy both are radiated by the filament.

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When electrical energy converts into light energy in bulb then some energy is wasted as in the form of heat. So How law of conservation of energy is valid in this case

Electrical Energy=Light Energy+Heat Energy. It does not matter whether you are able to use the heat energy or not the energy is conserved. The heat energy and the both energy both are radiated by the filament.

Electrical Energy=Light Energy+Heat Energy.
It does not matter whether you are able to use the heat energy or not the energy is conserved. The heat energy and the both energy both are radiated by the filament.