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The focal len...

Question

The focal length of eye lens of Ramsdens eyepiece is 1.6 cm. The distance from cross wires to field lens is

A

0.4 cm

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B

1.47cm

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C

1.07 cm

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D

3.2 cm

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Solution

The correct option is A 0.4 cm
For Ramsdens eyepiece, distance between cross wires and field lens $= \frac{f}{4} = \frac{1.6}{4} = 0.4 c m$

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