Answer: True
A water pump
belong to a positive displacement pump that provides constant flow of water at
fixed speed, regardless of changes in the counter pressure. The two main types
of positive displacement pump are rotary pumps and reciprocating pumps.
Moreover, water
pump is a reciprocating positive displacement pump that have an expanding
cavity on the suction side and a decreasing cavity on the discharge side. In
water pumps, the liquid flows into the pumps as the cavity on the suction side
expands and then the liquid flows out of the discharge as the cavity collapses
providing water in a pail.
How does the angle of incoming light compare to the angle of light reflecting off of the surface?
- <em>The measurements of the angles are equal.</em>
<u>For</u><u> </u><u>a</u><u> </u><u>smooth</u><u> </u><u>surface</u><u>,</u><u> </u><u>The</u><u> </u><u>angle</u><u> </u><u>of</u><u> </u><u>reflection</u><u> </u><u>and</u><u> </u><u>the</u><u> </u><u>angle</u><u> </u><u>of</u><u> </u><u>incidence</u><u> </u><u>are</u><u> </u><u>equal</u><u>.</u>
The light that makes up the image of the fish is refracted when it leaves the water and enters the air. Your brain thinks the light traveled straight, so the fish is not located in the direction from you that your brain thinks it is.
Answer:
a)
b) No, the ray will not penetrate into the water since 73.7° is greater than the critical angle.
Explanation:
Given that:
refractive index of oil,
angle of incidence,
refractive index of water,
(a)
Snell's law states that when a ray of light travels from a denser medium to a rarer medium its speed increases and it bends away from the normal. Likewise, when a ray of light travels from a rarer medium to a denser medium its speed slows down and it bends towards the normal.
Mathematically:
................................(1)
where the subscripts 1 & 2 denote for the incident ray and the refracted ray respectively.
Critical angle is that angle of incident of a ray of light through the optically denser medium on the two medium interface after which the refracted ray makes an angle of 90 degrees to the normal in the rarer medium.
- This is in accordance with the Snell's law that as we keep on increasing the the angle of incident on the optically denser side the angle of refraction keeps on increasing on the rarer side.
Now, using Snell's law eq. (1):
is the critical angle.
(b)
Since we have critical angle 65.92 degrees, so any value of the angle of incidence greater than that will lead to the reflection of the light from the interface of the two mediums, this phenomenon is called the total internal reflection.