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How are Electromagnetic waves different from Mechanical waves?
EM waves have very short wavelengths
EM waves transmit energy instead of matter
EM waves can travel through the vacuum of space (without particles)
EM waves can change direction by reflection
We use the symbol c to
represent the frequency of light.
represent the wavelength of light.
represent the speed of light.
The law of reflection states that
the angle of reflection is equal to the angle of incidence
the angle of reflection is greater than the angle of incidence
the image is laterally inverted
the image must be upright and the same size as the object
A ray of light hits a plane mirror. Using the diagram determine the angle of reflection.
What would you call this?
The refractive index of a medium is the ratio of the speed of light in a vacuum to the speed of light in that medium
Refraction occurs due to _____________
the change in the wave's speed when it enters a new medium
the wave bouncing off a boundary
the change in the wave's frequency when it enters a new medium
the wave bending around a barrier
Light has the lowest velocity in which medium?
flint glass n=1.70
In comparison to air, glass has (a)index of refraction.
A student placed a pencil in a cup of water. The pencil appears broken because light-
light travelling from water to air bends away from the normal making the pencil under water look closer to the surface
light travelling from water to air bends towards the normal making the pencil under water look further away
light travelling from air to water bends towards the normal making the pencil under water look higher up
light travelling from air to water bends away from the normal making the pencil under water look closer to the surface
Calculate the refractive index of the mystery material.
If the refractive index of water is 1.33, at what angle will the light shone by the diver exit the water.
If the refractive index of glass is 1.5 and the refractive index of water is 1.33, which ray A or B correctly shows how light is refracted travelling from glass to water?
When light travels from a slow to a fast medium & the incident angle is gradually increased
the angle increases until it reaches a fixed value
the angle decreases until it reaches 0
the angle increases until it reaches
the angle approaches the incident angle
A laser was shone on a glass prism and the angle of refraction was measured for a range of incident angles. The sine of both angles were plotted on a graph and a trend line with a gradient of 0.63 was determined. What is the refractive index of the glass?
The power output of a green laser is 5 mW. If the laser beam is a circle 1 mm in diameter, what is the intensity of the beam.
As light travels from medium x to medium y, it bends towards normal. The index of refraction for material x must be _____ that of material y.
impossible to tell
Light enters a glass block at an angle of 20° and the angle of refraction is measured to be 13°.
What is the refractive index of the glass, to 2 decimal places?
Which of the following is true about a wave that has been refracted?
The speed and frequency changes, but the wavelength stays the same.
The speed and wavelength changes, but the frequency stays the same.
The wavelength and frequency changes, but the speed stays the same.
The speed and frequency changes, but the amplitude stays the same.