Question

the effective focal length of ramsden's eyepice is 3cm the focal length of a single lens is ​

Answer 1

$\huge \underline \green{\sf{ Answer :- }}$

Effective focal length, F=3cm

For Huygens eyepiece, if focal length of field lens is f, then effective focal length F= f/2

=> f=2F

=6cm =0.06m

Focal power of field lens = 1/f

= 16.7D