Name three things that can happen when light strikes a material.
Light can be transmitted, reflected, and absorbed.
100
What is the difference in shape between concave and convex mirrors?
Concave mirrors curve inwards and convex mirrors curve outwards.
100
What is a lens ?
A lens is a piece of transparent material that is curved so that light rays will refract as they pass through it.
200
What type of material is it, when only some of the light is transmitted ?
The type of material is translucent.
200
What are the characteristics of the image that is reflected from a plane mirror?
The characteristics are same shape and size of the object, reversed, and upright.
200
What are two types of lenses ?
Convex and concave.
300
What is the angle of refraction ?
the angle of the ray of light that comes out of the boundary between the two materials, measured between the refracted ray and the normal.
300
List 2 examples of plane, concave and convex mirrors.
Quiet pool of water, bathroom mirrors / shaving & make-up mirrors / bicycle & security mirrors .
300
What is the shape difference of a convex and concave lens ?
Convex lenses are thicker in the middle and thinner at the edges.
Concave lenses are thinner in the middle and thicker at the edges.
400
Why do objects underwater seem closer to the surface than they are ?
Your brain assumes that all light rays travel in a straight line, but the light rays are refracted away from the normal as they pass from water to air and enter your eyes.
400
What is the term for light rays that spread apart after reflecting?
the term is 'Diverging' .
400
What is a focal length of a lens?
It is the distance from the centre of the lens to the focal point.
500
What is a mirage ?
a misleading appearance or illusion.
500
What is the difference between light rays that diverge and light rays that converge ?
The difference is light rays converging focuses together and diverging light rays spread apart.
500
Is the image upright or upside down for a concave and convex lens .. ?
Concave lenses form images upright and convex lens form upright or upside down images.