Lenses

Which of these is not true about a real image?

• It is enlarged.

• It is inverted

• It can be projected onto a screen.

• It appears behind the mirror.

A farsighted eye focuses an image ____.

• behind the retina

• in front of the lens

• in front of the retina

• on the retina

Which of the following uses a lens and two mirrors?

• binoculars

• microscope

• reflecting telescope

• refracting telescope

Which of the following uses a long-focal-length lens, a short-focal-length lens, and has an inverted image?

• binoculars

• microscope

• reflecting telescope

• refracting telescope

A compound microscope has one lens in the eyepiece (the part you look through). The eyepiece lens usually magnifies 20x.

• True

• False

A compound microscope may contain two or three lenses called objective lenses.

• True

• False

The point where the rays meet is known as....

• Fire

• the focal point

• refraction

• Plane of the lens

Tags

NGSS.MS-PS4-2

Is a convex lens thicker or thinner in the middle?

• Thicker 

• Thinner 

Which type of lens is used to correct farsightedness?

• Concave lens

• Convex lens

• Cylindrical lens

• Bifocal lens

What is the principal focus of a lens?

• The point where light rays parallel to the principal axis converge

• The center of the lens

• The point where the lens is thinnest

• The point where light rays diverge