Lenses and optical devices Flashcards
(17 cards)
In which media does light propagate in straight lines?
In any homogeneous medium.
Image created by concave lens
virtual, smaller, upright
What type of lens can be used to create a reduced and virtual image? Convex, concave or both?
Concave
What does the refractive power of a lens depend on? What does the focal length of a lens depend on?
lens shape and material
Describe the image obtained with a convex lens when the object is 2F away from the lens.
Real, inverted, same size
Describe the image created inside an eye.
Real, inverted, reduced
What type of lens is needed to correct farsightedness? Nearsightedness?
Farsightedness - convex
Nearsightedness - concave
What is a thin lense?
a lens whose thickness is very small compared to its surface area
What types of lenses are used for glases?
Convex, concave
What types of lenses are used for camera?
Convex
What types of lenses are used for projectors?
convex
What types of lenses are used for microscopes?
Two convex lenses
What types of lenses are used for telescopes?
Two convex lenses
What is a lens
Transparent body bounded by two spherical surfaces
What is a lens focal point?
The point where rays parallel to the optical axis intersect
What does the magnification of a lens show?
large (or small) a subject can be reproduced on the image plane
What type of lens can be used to obtain an inverted image?
Convex
