Two thin lenses have a combined power of 
. When they are separated by a distance of 
, their equivalent power becomes 
. Their individual powers (in dioptres) are
Text Solution
Verified by ExpertsThe correct answer is:
C
: When two thin lenses of powers 
and 
are held in contact with each other, the power of the combination is given by
When two thin lenses of power 
and 
are separated by a distance 
, the equivalent power is given by
On solving (i) and (ii), we get
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