Geometric Optics
Which of the following best describes what a convex lens does to parallel light rays?
It causes the light rays to diverge.
It causes the light rays to converge at a focal point.
It has no effect on the light rays.
It bends the light rays into a parallel beam.
A convex lens is being used as a magnifying glass. Where must the object be placed relative to the lens for it to function as intended?
At a distance further than twice the focal length.
Exactly at the focal length.
At a distance less than the focal length.
At twice the focal length.
What effect does a concave lens have on parallel light rays?
It converges the light rays to a single point.
It diverges the light rays, spreading them out.
It focuses the light rays on the same side of the lens.
It has no effect on the light rays.
A person is using eyeglasses with concave lenses. What vision problem are these lenses most likely correcting?
Farsightedness
Astigmatism
Nearsightedness
Presbyopia
Which of the following is a key characteristic of a real image?
It cannot be viewed directly.
It can be projected onto a screen.
It is always upright.
It is formed by diverging light rays.
In which of the following scenarios is a real image formed?
Looking at your reflection in a flat mirror.
Using a magnifying glass to view an object.
A movie projector displaying an image on a screen.
Looking through a peephole in a door.
Which of the following is a characteristic of a virtual image?
It is formed by converging light rays.
It can be projected onto a screen.
It appears on the opposite side of the lens from the object.
It cannot be projected onto a screen.

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In which of the following scenarios is a virtual image formed?
The image formed on the retina of the eye.
The image formed by a camera lens on the sensor.
The image you see in a mirror.
The image projected onto a movie screen.
An object is placed 20 cm from a lens with a focal length of 10 cm. Using the thin-lens equation, what is the image distance?
5 cm
10 cm
20 cm
40 cm
An object is placed a distance from a lens, and an image is formed at a distance from the lens. If the image distance is twice the object distance () and the focal length of the lens is 20 cm, what is the object distance?
10 cm
20 cm
30 cm
40 cm