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Question
If the focal length of the object glass is 25 cm and the distance from object  glass to the tunnion axis is 15 cm, the additive constant is
;fn vfHkn`';d dh ukfHkdh; nwjh 25 lseh gS vkSj vfHkn`';d ls Vªfu;u v{k dh nwjh 15 lseh gS] rks ;ksxkRed fLFkjkad gSA
A.
0.1
B.
0.4
C.
0.6
D.
1.33
Answer ( Option B)

0.4

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