defence exam SSB Head Constable (Communication) 2023 Mock Test Physics Optics Refraction and Reflection

25 cm फोकस दूरी वाले लेंस की शक्ति ____ है।

1

+2.5 डायोप्टर

2

+3 डायोप्टर

3

+4 डायोप्टर

4

+5 डायोप्टर

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