Complete question is;
In searching the bottom of a pool at night, a watchman shines a narrow beam of light from his flashlight 125 cm above the water level to a point 185 cm from his foot at the edge of the pool. Where does the spot of light hit the bottom of the pool, relative to the edge, if the pool is 215 cm deep
Answer:
356.2 cm
Explanation:
First of all, let's find the angle of incidence from the distances
;
tan θ1 = l1/h1
tan θ1 = 185/125
tan θ1 = 1.48
θ1 = tan^(-1) 1.48
θ1 = 55.95°
For the refraction from air into water, we have
n_air × sin θ1 = n_water × sin θ2,
sin θ2 = (n_air × sin θ1)/n_water
Where,
n_water is refractive index of water = 1.33
n_air is refractive index of air = 1
Thus;
sin θ2 = (1 × sin 55.95)/1.33
sin θ2 = 0.62297
θ2 = sin^(-1) 0.62297
θ2 = 38.53°
So, the horizontal distance from the edge of the pool from
l is;
l = l1 + l2 = l1 + h2 tan θ2
where;
l1 = 185cm
h2 = 215 cm
So,
l = 185 + 215(tan 38.53)
l = 185 + 171.2045
l = 356.2045 cm ≈ 356.2 cm
Answer:
Explanation:
I think that you to run more than 12 miles
We can solve the problem by using Snell's law, which states
where
is the refractive index of the first medium
is the angle of incidence
is the refractive index of the second medium
is the angle of refraction
In our problem,
(refractive index of air),
and
(refractive index of carbon disulfide), therefore we can re-arrange the previous equation to calculate the angle of refraction:
From which we find
Answer: (c) Context Effect
Explanation: Context Effect is an aspect of cognitive psychology which describes how environmental factors afects a person's perception of stimuli. It is known to occur at all scales at which words may be viewed. It is supported by constructive perception, the effect of a context perception is known to be part of a top-down design, the view of the moon through a narrow tube which has affected the perception of the viewer who now see the moon as shrinking in size is a context perception.
