a) A fish is 60 cm beneath the surface of a pond. An insect is flying directly overhead. If the insect is exactly 20 cm above the surface of water, how far above the surface does the insect appear to the fish? (Given: Refractive index of water = 1.33) %3D
Refraction of Light
Refraction is a change in the direction of light rays when they travel from one medium to another. It is the bending of light when it goes through different media.
Angle of Refraction
Light is considered by many scientists to have dual nature, both particle nature and wave nature. First, Particle nature is one in which we consider a stream of packets of energy called photons. Second, Wave nature is considering light as electromagnetic radiation whereas part of it is perceived by humans. Visible spectrum defined by humans lies in a range of 400 to 700 nm wavelengths.
Index of Refraction of Diamond
Diamond, the world’s hardest naturally occurring material and mineral known, is a solid form of the element carbon. The atoms are arranged in a crystal structure called diamond cubic. They exist in a huge variety of colours. Also, they are one of the best conductors of heat and have a very high melting point.
![a) A fish is 60 cm beneath the surface of a pond. An insect is flying directly overhead. If the
insect is exactly 20 cm above the surface of water, how far above the surface does the
insect appear to the fish? (Given: Refractive index of water = 1.33)
b) An object and a screen separated by a distance of 72.0 cm. At what location(s) between
the object and the screen should a convex lens of focal length 10.0 cm be placed so as to
produce a clear image on the screen?
c) A lens maker has to grind a convex lens with a focal length of 80.0 cm. The glass used for
the lens has a refractive index, n = 1.5. If the radius of the curvature of the front surface is
35.0 cm, determine the radius of the other surface.
d) Total internal reflection occurs when there is a difference of transparent medium density.
Explain how total internal reflection take place and how can it be useful.
|](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9547960d-e9f0-46d7-8464-0c083429fd86%2Fb95772ff-75c4-4463-becb-8a0a537bd7a3%2Fonqbwsr_processed.png&w=3840&q=75)
![a) Explain the purpose of Van de Graaff generator and how it produce electrical potential.
b) The diagram shows the electric field produced by two poibnt charges A and B. State and
explain
i.
whether each of the charges is positive or negative
ii. which charge has greater magnitude
c) The figure below shows a three point charges +2.0µC. –3.0µC and +4.0µC are fixed at
their respective positions. Calculate the resultant force on the charge of –3.0µC.
+2.0 μC
5.0 m
3.0 m
-3.0 μC
4.0 m
+4.0 μC](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9547960d-e9f0-46d7-8464-0c083429fd86%2Fb95772ff-75c4-4463-becb-8a0a537bd7a3%2Fysdyfnh_processed.png&w=3840&q=75)
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