Last Updated On [03-11-2023]
The focal length of the field lens (which is an achromatic combination of two lenses) of telescope is 
. The dispersive powers of the two lenses in the combination are 0.024 and 0.036. The focal lengths of two lenses are
a)
30 
and 
b)
30 
and 
c)
45 
and 
d)
15 
and 
The focal length of the field lens (which is an achromatic combination of two lenses) of telescope is . The dispersive powers of the two lenses in the combination are 0.024 and 0.036. The focal lengths of two lenses are
a)
30 and
b)
30 and
c)
45 and
d)
15 and
Question ID - 152453 :-
The focal length of the field lens (which is an achromatic combination of two lenses) of telescope is . The dispersive powers of the two lenses in the combination are 0.024 and 0.036. The focal lengths of two lenses are
a)
30 and
b)
30 and
c)
45 and
d)
15 and
|
The focal length of the field lens (which is an achromatic combination of two lenses) of telescope is |
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|
a) |
30 |
b) |
30 |
c) |
45 |
d) |
15 |
|
(b) For achromatic combination Solving above equations we get |
and 
Next Question :
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a) |
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b) |
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c) |
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d) |
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and
are focal lengths of objective and eyepiece respectively of the telescope. The angular magnification for the given telescope is equal to
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