ഇപ്പോൾ ഈ വികിരണത്തിന്റെ ഗുണങ്ങൾ ഒന്നാമതാണ്, വികിരണത്തിന്റെ സ്വഭാവം വസ്തുവിന്റെ ജ്യാമിതീയ രൂപത്തെ ആശ്രയിക്കുന്നില്ല.
ఇప్పుడు ఈ వికిరణం యొక్క లక్షణాలలో మొదటిది, వికిరణం యొక్క స్వభావం, వస్తువు యొక్క జ్యామితి రూపంపై ఆధారపడి ఉండదు.