Question

Write the special properties of huygen's and ramsden eyepiece

Answer 1

In Ramsden eyepiece the light comes to focus at the focal point of the objective and then spreads out until it enters the first element . The first element then directs the light towards the second element . After exiting the second element the light is now collimated and enters your eye. Where as…

In Huygens eyepiece the converging light does not come to focus before entering the first element however,the end result is same the light leave the second element collimated.

Answer 2

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$\boxed{\huge{\textbf{RAMSDEN EYE PIECE}}}$


Ramsden eye piece are consisting of two particular plano-convex fully equally adjusted lenses and which are separated by a specific distance which is $\bf{\frac{2 \: focal \: length}{3}}$.

1) Ramsden eye piece is minimising the chromatic aberrations from the received light wavelengths as well as it supports the reduction for spherical aberrations too but will not or doesn't eliminate them completely.

2) Cross wires in Ramsden plano-convex eye piece lenses are indeed placed at art particular distances by a value of $\bf{\frac{Focal \: length \: or \: f}{4}}$ in straight or a frontal lens or field lens.

3) Ramsden can also be used for magnifying the objects to see them as a real object as it's a eye piece focal lens.


$\boxed{\huge{\textbf{HUYGENS EYE PIECE}}}$


Huygens eye pieces are consisting of two particular plano-convex lenses of given focal lengths as 3 focal length or 3 f and focal length or f which are evenly separated by equally maintained distances of D or d = 2 focal length or 2 f.

1) Huygens eye pieces are conditionally satisfying their criteria for a definite elimination factor or basically completely eliminates he spherical aberrations received from a wavelength of the light as well as chromatic aberrations in this it has this formula specifically for it.

$\boxed{\bf{d = \frac{f_1 + f_2}{2} = \frac{3f + f}{2} = 2f}}$

Also,

$\boxed{\bf{d = f_1 - f_2 = 3f - f = 2f}}$

2) Cross wires in Huygens plano-convex eye piece lenses are to be placed in between or select mean in them by field lens and eye lens. This is the reason of which it becomes a important property for magnifying images in virtual objects and makes the cross wires are varying in high levels. Due to this cross wires in them are not provided in Huygens eye piece lenses.

3) Since, as said above, Huygens plano-convex eye piece lenses can't be used in particular to focus on real objects instead it focuses on virtualised objects covering behind the frames. This makes the field lines and the eye lines to be fitted into that specific range making the object virtually magnified.


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