Pick up the correct specification of Ramsden eyepiece from the following :

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Question:
 
Pick up the correct specification of Ramsden eyepiece from the following :

1.it consists of two equal piano convex lenses

2. the curved surfaces of plano-convex lenses face each other

3. the two lenses are separated by a distance equal to 2/3 of the focal length of either lens.

4.all the above.

Posted Date:-2021-03-26 07:54:39

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