0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

A convex lens of focal length f made of glass of refractive index 1.5 is immersed in water of refractive index 4/3. Then focal length:
  1. Greater than f
  2. f
  3. Less than f
  4. f

A
f
B
f
C
Greater than f
D
Less than f
Solution
Verified by Toppr

Lensmaker equation gives the relation for focal length as
1f=(n1n21)Kshape

Given that, in air, the focal length of the lens is f
Kshape=12f

Focal length in water is given by
1fwater=(n1n21)Kshape=(3/24/31)12ffwater=16f

Was this answer helpful?
6
Similar Questions
Q1
A convex lens of focal length f made of glass of refractive index 1.5 is immersed in water of refractive index 4/3. Then focal length:
View Solution
Q2
A lens made of glass of refractive index 32 has focal length f. Find its focal length when it is immersed in water of refractive index 43.
View Solution
Q3
If a lens of focal length, f, made of glass of refractive index 53 is placed in a liquid of refractive index, 4 53, then the focal length of the lens becomes
View Solution
Q4
A thin lens made of glass (refractive index=1.5) of focal length f=16 cm is immersed in a liquid of refractive index 1.42. If its focal length in liquid is f1, then the ratio f1/f is closest to the integer:
View Solution
Q5
A thin convex lens of focal length f made of crown glass is immersed in a liquid of refractive index μ1(μ1>μ2) where μc is the refractive index of the crown glass. The convex lens now is
View Solution