P14- Light Flashcards
What does the law of reflection state?
1) The law of reflection states that the angle of incidence = the angle of reflection.
Where is the angle of incidence and angle of reflection for a light ray reflected by a plane mirror?
1) The angle of incidence is the angle between the incidence ray and the normal.
2) The angle of reflection is the angle between the reflected ray and the normal.
What is specular reflection?
What is diffuse reflection?
1) Specular reflection is reflection in a single direction without scattering.
2) Diffuse reflection is reflection from a rough surface that scatters the light.
What is the normal?
What is the Angle of Incidence?
What is the Angle of Reflection?
1) The normal is te line perpendicular to the mirror.
2) The Angle of Incidence is the angle between the incident ray and the normal.
3) The angle of reflection is the angle between the reflected ray and the normal.
Where is a virtual image formed?
How is a real image formed?
1) A virtual image is formed at a place where light rays appear to come from after they have been reflected or refracted.
2) A real image is formed by focusing light rays onto a screen.
What is Refraction?
1) Refraction is the change in direction of waves when they travel across a boundary from one medium to another.
What happens to the angle of refraction when a light ray refracts as it travels from air to glass?
What happens to the angle of refraction when a light ray refracts as it travels from glass to air?
1) The angle of refraction is less than the angle of incidence
2) The angle of refraction is more than the angle of incidence.
What happens to the wavelength of light when it moves across the visible spectrum?
1) The wavelength of light increases from violet to red across the visible spectrum.
What does the colour of a surface depend on?
1) The colour of a surface depends on the pigments of the surface materials and the wavelengths of light the pigments absorb.
What is the difference between a translucent and transparent object and an opaque object?
1) A translucent object lets light pass through but scatters or refracts the light inside it.
2) A transparent object lets all the light that enters it pass through it and does not scatter or refract the light inside the object.
3) An opaque object is an object that absorbs all the light that reaches it, the light is either reflected, scattered at the surface, or absorbed by the object. An opaque object cannot be seen since no light travels all the way through.
What is a convex lens?
What is a concave lens?
1) A convex lens focuses parallel rays to a point called the principal focus.
2) A concave lens makes parallel rays spread out as if they had come from the principal focus.
