Question

24.
Water lens is made of double convex lens of radius of curvature "R". Write
lens makers formula for water lens.
a
1​

Answer 1

Water lens.

Explanation:

• P (lens) = ((n lens -n_0))/n_o  x (1/R - 1/R1)
• Water lens is also called Ghyben-Herzberg.
• In this formula, fresh groundwater is used as a convex-shaped layer.
• Here 'n' is the refractive index of the lens that is water and N o is the refractive index of the medium.
• 'R' is positive as we measure it from the front surface.

Learn more about convex lens.

What is a convex lens

https://brainly.in/question/1333877

Answer 2

Answer:

Explanation:

Here water lens formed by a double convex lens looks like plano concave lens.

We know that,

Lens makers formula 1/f=(n-1)1/R1-1/R2

Here R1=positive and R2 = infinity (plane surface radius of curvature is infinity)

By applying these values we get

1/f =( n -1 ) 1/R1 - 1/infinity

So ,the lens makers formula of water lens is

1/f = ( n -1 ) 1/R1