Waves Can Be Refracted Flashcards
What is a wave ?
A wave is a regular vibration that carries energy.
Eg ripple on the surface of a pond, ultrasound,x-rays,and infrared rays are all types of waves
Recall that waves are refracted and reflected at boundaries between different materials
If a wave hits the boundary face on it slows down but carries on in the same direction but if it meets at a different medium at an angle the wave hits the denser layer first and slows down , so the wave changes and gets refracted .
What does a naked eye help do ?
A naked eye is used for mapping positions
What are telescopes used for ?
This is used to magnify images so distant objects can be seen in more detail. However they are expensive .
What are photographs used for ?
These allow you to zoom in and look at objects in more detail . You can also compare the taken image .
What were the observations of Galileo ?
Galileo discovered that 4 moons were orbiting Jupiter . This showed that not everything orbited the earth this proved that the geocentric model was wrong and also provide evidence for the heliocentric model.
How do lenses work ?
A lens works by refraction it bends light rays as they pass through it so they change direction.
A convex lens also known as converging lens converges because it makes parallel light rays passing through it bend inward and meet at a spot just beyond the focal point .
What is a wavelength ?
A distance from 1 peak to the next
What is a frequency ?
A frequency is how many complete waves there are per second . Measured in hertz
What is an amplitude ?
The height of the wave from the midline peak .
What is a real image ?
A real image is where light from an image forms and object on the screen .
What is a virtual image ?
Rays are diverging
Light from the object appears to come
From a different place
What is an eyepiece lens?
An eyepiece lens magnifies the image
What is an objective lens ?
The objective lens forms an image if a distant object as it’s focal point
How does a reflecting telescope work ?
In a reflecting telescope the image is formed by reflection from a curved mirror. It is then magnified by a secondary mirror.
