Lens' Flashcards
Describe the shape of a concave
Concave is narrow at the middle
What does convex do
Causes rays of light to be brought to a focus
What does concave do
Causes Rays of light to spread apart
How can the focal length be measured
By placing the lens infront of paper until a Sharp image of an object in the distance is on the paper and measures the distance from lens to paper
How is long sighted corrected
With a convex lens
How is short sighted corrected
Concave
What is shortsightedness
The lens is too strong or cornea too curved or eyeball too big close images focused but blurred distant
What is long sightedness
Distant objects in focus close blurred the lens is too weak or the cornea not curved enough or eyeball too short
What can all waves in the electromagnetic spectrum do
Reflect and refract
Describe the shape of a convex lens
The shape is oval
