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Practice #14,836
Q
जब एक व्यक्ति तीव्र प्रकाश क्षेत्र से अंधेरे कमरे करता है, तो उसे कुछ समय के लिये स्पष्ट दिखाई नहीं देता है, बाद में धीरे- धीरे उसे चीजें दिखाई देने लगती है इसका कारण है ?
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