If focal length of the objective and eye-piece of a telescope are 10 cm and 4 cm respectively, what will be its magnifying power in
(i) normal adjustments,
(ii) adjustment where image of distance object is formed at D? Given D = 25 cm.
Focal length of objective fo = 10 cm
Focal length of eyepiece fe = 4 cm
(i) In normal adjustment
m =
= 2.5
(ii) when the final image of distant object is at D, then
m =
=
= 2.9
Focal length of eyepiece fe = 4 cm
(i) In normal adjustment
m =
= 2.5(ii) when the final image of distant object is at D, then
m =
=
= 2.9
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If we need magnification of 375 from a microscope of tube length 15 cm and objective of focal length 0.5 cm, what focal length of eye-piece should we use?