সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
Dry sand appears bright while wet sand appears dark because of--
Dry sand appears bright while wet sand appears dark because of--
- ক. optical illusion
- খ. diffraction
- গ. reflection
- ঘ. refraction
সঠিক উত্তরঃ reflection
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Basic Information of Daily Science, Inventions and...