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प्रश्न
Give reason for the following:
The photographic darkrooms are provided with infrared lamps.
कारण बताइए
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उत्तर
Infrared lamps are used in dark rooms for developing photographs since they do not affect the photographic film chemically, but they provide some visibility.
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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 6: Spectrum - EXERCISE - 6 (B) [पृष्ठ १४५]
