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5. The space to height ratio in illumination lies between [SSC JE EE 2018]
4. Which of the following will need lowest level of illumination? [SSC JE EE 2018]
3. Radiant efficiency of a luminous source depends on on………..[SSC JE EE 2021]
2. Lux is unit of which physical quantity? [SSC JE EE 2018]
