A thin convex lens made from crown glass 
has focal length f. When it is measured in two different liquids having refractive indices 
and 
, it has the focal lengths f 1 and f 2 respectively. The correct relation between the focal length is :
Text Solution
Verified by ExpertsThe correct answer is:
B
⇒ f = 2x here 
: ⇒ f 2 is negative
⇒ f 1 = 4f
Analytically, If a lense is inserted in a denser sourrounding the sign of focal length changes and if lens is inserted in a rarer sourrounding, the sign of focal length remain same.
If lense is inserted in rarer medium the focal length increases.
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