The focal length of a plano convex lens is f and its refractive index is 1.5 . It is kept over a plane glass plate with its curved surface touching the glass plate. The gap between the lens and the glass plate is filled by a liquid. As a result, the effective focal length of the combination becomes 
. Then the refractive index of the liquid is
Text Solution
Verified by ExpertsThe correct answer is:
C
According to lens maker's formula
The focal length of plane convex lens is
or 
The focal length of liquid lens is
[Using (i)]
Effective focal length of the combination is
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
PHYSICS
SINGLE CORRECT MCQ
If the nuclear radius of is , the approximate nuclear radius of in fe…
A resistance of is connected to a source of an alternating potential . The time taken by the curr…
The following figure shows a logic gate circuit with two inputs and and the output . The voltage…
The equation of a wave on a string of linear mass density is given by
The tension in the string i…
Two bodies of mass and have position vectors and respectively. The magnitude of position vector…
At what distance from a long straight wire carrying a current of will the magnetic field be equal …