engineering recuitment BARC Stipendiary Trainee Category II 2023 Mock Test Physics Optics Refraction and Reflection

यदि लेंस की शक्ति 1D है।तो लेंस की फोक़स दूरी क्या होगी?

1
10 m
2
1 cm
3
100 cm
4
50 mm
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