railway RRB Technician Grade 3 Mock Test 2024 Physics Optics Refraction and Reflection

एक उत्तल लेंस की फोकस दूरी क्या होगी जिसकी शक्ति 1·5 D है ? 

1
+ 1·5 m
2
+ 66·6 cm
3
– 66·6 cm 
4
– 1·5 m
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