If the focal length of the eye lens in Ramsden's eyepiece is $f$ , then the focal length of the field lens and separation between the field lens and cross wires are respectively :
$3 f$ and $f$
$f$ and $f / 4$
$3 f$ and $2 f$
$2 f$ and $3 f$

Question

If the focal length of the eye lens in Ramsden's eyepiece is $f$ , then the focal length of the field lens and separation between the field lens and cross wires are respectively :
$3 f$ and $f$
$f$ and $f / 4$
$3 f$ and $2 f$
$2 f$ and $3 f$

Toppr Admin · Accepted Answer

In Ramsden-apos-s eyepiece focal length of eye-piece and field lens is same- so- focal length of field lens is f-separation between field lens and cross wires in Ramsden-apos-s eyepiece is f4- Hence correct option is B-

If the focal length of the eye lens in Ramsden's eyepiece is f, then the focal length of the field lens and separation between the field lens and cross wires are respectively :3f and ff and f/43f and 2f2f and 3f

In Ramsden's eyepiece focal length of eye-piece and field lens is same. so, focal length of field lens is f.separation between field lens and cross wires in Ramsden's eyepiece is f4. Hence correct option is B.

If the focal length of the eye lens in Ramsden's eyepiece is $f$ , then the focal length of the field lens and separation between the field lens and cross wires are respectively :
$3 f$ and $f$
$f$ and $f / 4$
$3 f$ and $2 f$
$2 f$ and $3 f$

In Ramsden's eyepiece focal length of eye-piece and field lens is same. so, focal length of field lens is $f$ .
separation between field lens and cross wires in Ramsden's eyepiece is $\frac{f}{4}$ . Hence correct option is B.