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Physics Lab Observation Sheet
RESOLVING POWER OF TELESCOPE
2009-2010
PREPARED BY: Mr. CHARIS ISRAEL ANCHA M.Sc., (Ph.D.) Asst. Prof. of PHYSICS Mob. No: +91-9866934653
www.charis-ancha.blogspot.com
Page 1
Physics Lab Observation Sheet
Exp. No:
RESOLVING POWER OF TELESCOPE
2009-2010
RESOLVING POWER OF TELESCOPE
Date: Aim: To verify the expression for the Resolving Power of a Telescope. Apparatus: Telescope, Micrometer Eye Piece, Measuring tape, Sodium vapor lamp, double slit. Formulae: 1) The experimental value of the resolving power of telescope is θ
d =
D between the two slits and ‘D’ is the distance of the slit from the telescope.
2) The theoretical value of the resolving power of telescope is θ
λ =
a
where ‘d’ is the separation
where ‘ λ’ is the wavelength of the
source and ‘a’ is the width of the slit in just resolved position.
Figure:
d Micro Micromet meter er Eye Piece Piece
Telescope
Ligh Lightt Sour Source ce Doub Double le Slit Slit
D
Procedure: 1) The given double slit is fitted to a slit stand and place closer to the sodium vapor source, such that the two slits are clearly visible from the telescope. 2) The telescope is placed at a distance of 1.5 meter from the double slit and fix the micrometer eye piece to the objective of the telescope with its slit completely open. 3) Observing through the telescope adjust the focus using rock and pinion screw of the telescope so that the two slits are clearly visible and decrease the width of the slit of the micrometer eyepiece slowly position. Note the readings of the till the two slits come closer and closer to attain the just resolved position. micrometer eye piece. 4) Further decrease the width of the adjustable slit such that the field of view becomes completely dark and note the readings of the micrometer eye piece. 5) Repeat the steps 2, 3 and 4 by increasing the distance of the telescope in the steps of 50cm and ‘a’. calculate the value of width of the slit in just resolved position ‘a’.
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Page 2
RESOLVING POWER OF TELESCOPE
Physics Lab Observation Sheet
2009-2010
Observations: d = ________mm. The separation between the slits of the double slit, d = The wave length of the given source of light,
λ
= _________m.
Least Count of the Micrometer Eye Piece: Pitch of the Screw =
Least Count, L.C. =
Tabular:
distance moved on the main scale no. of rotations of the screw
mm
pitch of the screw no. of divisions on the circular scale
=
mm
_________ mm.
=
________ mm.
Determination of width of the slit in Just Resolved Position ‘a’: Readings of Micrometer eye piece
S. No
Just resolved position Completely dark Distance of Total ‘X’ M.S.R C.S.R Total ‘Y’ Telescope M.S.R C.S.R ‘a’
1.
1.5m
2.
2m
3.
2.5m
4.
3m
‘b’
a+(b x L.C.)
mm
‘a’
‘b’
a+(b x L.C.)
mm
Width of ‘a’ the slit in a = X-Y meter mm
λ /a
-3
x10
d/D -3 x10
Precautions: 1) 2) 3) 4)
The adjustable slit of the micrometer eye piece should be vertical. The axis of the telescope should be horizontal and perpendicular to the plane of the double slit. Both double slit and the telescope should exactly at the same height. The just resolved position of the slits must be exactly located.
Result: The values of λ /a and d/D and d/D at each distance are exactly matching. Hence the resolving power of the telescope is verified.
