In horizontal angles, the error due to imperfect levelling of the plate bubble is

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Question: In horizontal angles, the error due to imperfect levelling of the plate bubble is

1. large when sights are nearly level

2.large for long sights

3.less for steeply inclined sights

4. large for steeply inclined sights.

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  1. In horizontal angles, the error due to imperfect levelling of the plate bubble is
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