railway RRB Technician Grade 1 Mock Test 2024 General Science Physics Optics

બહિર્મુખ લેન્સની ફોકલ લંબાઈ 50 સે.મી છે. તેના પાવરની ગણતરી કરો.

1
4 D
2
1 D
3
2 D
4
3 D
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