Question

Lens maker's formula is applicable to Thin lenses and paraxial rays which subtend very small angles with the principal axis. Thick lenses and paraxial rays which subtend very small Thin lenses and for marginal rays Thick lenses and for marginal rays

Answer 1

Answer:physics ans

Explanation:

Let actual height be h and the apparent height be h'.

Here, the refraction is taking place from rarer to denser medium and a virtual image is formed.

Using

μ1

-u

 

+

μ2

v

 

=

μ2-μ1

R

 

Where refractive index of water is μ2 and refractive index of air is μ1.

u and v are object and image distances, respectively.

R  is the radius of curvature, here we will take it as ∞.

μ1

-u

 

+

μ2

v

 

=

μ2-μ1

∞

 

μ1

u

 

=

μ2

v

 

v=

μ2  

μ1

 

×u

As μ1 = 1

v = u × μ2

We know magnification is given by:

m=

v

u

 

Putting the value of v in the above equation:

m=

u×μ2

u

 

m=μ2

As the magnification is greater than 1, so the apparent height seems to be greater than actual height.

Answer 2

Answer: Thin Lenses and Paraxial rays which subtend very small angles

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