गेजेर मुगानि आरबारिफोराबो मोनसे तम्बुवाव ` केमेरा अबस्क्यूरा ` ( Camera Obscura ) बाहायनायखौ मुंखʼनाय दं , थामहिनबा बेखौ गनायनायनि थोजासे फोरमान मोनो दि जोबोर गोजाम मुगानि रासायन बिगियानगिरि आरो बिगियानगिरिफोरनि गेजेरजों ’ अप्टिकेल सान्थौ ’ ( Optical Principles ) नि सायाव सावगारि बानायनायनि खान्थिफोरखौ जौगाहोनाय जादोंमोन ।
Mention of use of ` Camera Obscura ` in a tent by Medieval Arabs also found , it means there are enough source to believe in this that methods of making pictures on the basis of optical principles were developing by alchemist and scientist since very old days .