1. A farmer uses a constant horizontal force of magnitude 21 Na
wagon and moves it a horizontal displacement of magnitude 32 m
How much work has the farmer done on the wagon?

The horizontal distance from the to the bottom of the pool is 3.831 m

Solution:

As per the question;

Height of the pool, H = 1.5 m

Depth of the pool, D =   2.75 m

Refractive index  of air,

Refractive index  of air,

Angle of the beam at the water surface,

Now,

The angle of incidence is given by

Now, using Snell's law:

Now,

From the normal, the horizontal image distance, d' is given by:

Now,

From the normal, the horizontal object distance, d'' is given by:

Thus the horizontal distance is given by:

d' + d'' = 1.979 + 1.852 =3.831 m