Two converging lenses, with focal lengths f1 and f2 are positioned a distance f1 + f2 apart, as shown in the figure below. Arrangements like this are called beam expanders and are often used to increase the diameters of light beams from lasers. a. If W1 is the incident beam width, show that the width of the emerging beam is W2 = f2/f1 * W1 b. Show how a combination of one diverging and one converging lens can also be arranged as a beam expander. Incident rays parallel to the axis should exit parallel to the axis c. Calculate the ratio of the intensity of the beam emerging from the beam expander to the intensity of the laser beam.
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.
Two converging lenses, with focal lengths f1 and f2 are positioned a distance
f1 + f2 apart, as shown in the figure below. Arrangements like this are called beam
expanders and are often used to increase the diameters of light beams from lasers.
a. If W1 is the incident beam width, show that the width of the emerging beam is
W2 = f2/f1 * W1
b. Show how a combination of one diverging and one converging lens can also be
arranged as a beam expander. Incident rays parallel to the axis should exit
parallel to the axis
c. Calculate the ratio of the intensity of the beam emerging from the beam
expander to the intensity of the laser beam.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
