Last Updated On [03-11-2023]
Two thin lenses of focal lengths 
and 
are placed in contact with each other. The focal length of the combination is
a)
b)
c)
d)
Two thin lenses of focal lengths and are placed in contact with each other. The focal length of the combination is
a)
b)
c)
d)
Question ID - 152415 :-
Two thin lenses of focal lengths and are placed in contact with each other. The focal length of the combination is
a)
b)
c)
d)
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Two thin lenses of focal lengths |
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a) |
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b) |
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c) |
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d) |
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(c) When From lens formula
Adding Eqs. (i) and (ii), we get
If this lens is replaced by a single lens, then focal length of combination is
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and 
are focal lengths of lenses combined together, image formation takes place as follows
Next Question :
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In an astronomical telescope in normal adjustment, a straight black line of length |
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a) |
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b) |
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c) |
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d) |
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is drawn on the objective lens. The eyepiece forms a real image of this line. The length of this image is 
. The magnification of the telescope is
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