1sry not heard of this term earlier
May be the the focal length of some kind of spectacle...that too not this small...and not sure
In a Ramsden's Eye piece of effective focal length 3 cm the length of the eye piece is :
a) 1.5 cm
b) 8/3 cm
c) 3 cm
d) 4 cm
FIRST TELL ME WATS THIS RAMSDEN EYE PIECE
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10 Answers
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1soory bro ans is (d) 4 cm...
pehle yeh bata ki yeh hota kya hai....
1hey i got it
Effective focal length is 3F/4
so then F will be 4/3*3 and thats 4 cm.
so answer is (D)
1this is used as eyepiece in optical instruments for increasing magnification of optical instruments.