2 years, 4 months ago
how index correction between lens and object needle can be found in lab by placing them at knitting needle distance?
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M$1 Answer
To determine index correction , we take sharp edged straight knitting needle.Measure its actual length using the metre rod.This actual length is called real distance( x ).Arranege the uprights containing the mirror and the needle on the optical bench.Adjust their heights so that centre of the mirror and tip of the needle lie on the same horizontal line i.e the two are at the same height.Adjust the distance between the uprights so that one end of knitting needle touches the knitting needle and the other end of the knitting needle touches the centre of the mirror.Read the positions of the index marks carrying the two uprights. The difference in these positions gives us the observed distance( y ).
Index correction = Real distance - observed distance
= x - y
This may be +ive or -ive.
Index correction = Real distance - observed distance
= x - y
This may be +ive or -ive.
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
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