A) \[{{f}_{1}}=3{{f}_{2}}\] and \[d={{f}_{1}}+{{f}_{2}}\]
B) \[{{f}_{1}}={{f}_{2}}\] and \[d=\frac{2}{3}{{f}_{1}}\]
C) \[{{f}_{1}}=\frac{2}{3}{{f}_{2}}\] and \[d=\frac{2}{3}{{f}_{1}}\]
D) \[{{f}_{1}}={{f}_{2}}\] and \[d={{f}_{1}}+{{f}_{2}}\]
Correct Answer: B
Solution :
Key Idea: Ramsdens eyepiece is also known as positive eyepiece. Ramsdens eyepiece is an eyepiece consisting of two plano-convex lenses of equal focal length placed with their curved surfaces towards each other, and separated by a distance somewhat less than the focal distance of the nearest eye, the image of the object viewed beyond both lenses. The two lenses are separated by a distance of \[\frac{2f}{3}\].
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