Geometric Optics

A ray of light parallel to the optic axis of a concave mirror is reflected back

• through the center of the sphere.

• through the focal point.

• parallel to the optic axis.

• as if it came from the focal point.

The back surfaces of automobile/motorcycle headlights are curved

• because inverted, real images of filaments shine brighter.

• to concentrate light in one direction.

• for structural reasons not related to optics

• to get multiple images of the filament.

What type of image is formed when an object is placed at a distance of 1.5 focal lengths from a convex mirror?

• erect and virtual

• inverted and virtual

• erect and real

• inverted and real

Where is the image located when an object is placed 30 cm from a convex mirror with a focal length of 10 cm?

• 7.5 cm in back

• 15 cm in back

• 30 cm in back

• 7.5 cm in front

The critical angle for total internal reflection at an air-water interface is approximately 48degrees. In which of the following situations will total internal reflection occur?

• light incident in water at 40 degrees

• light incident in water at 55 degrees

• light incident in air at 40 degrees

• light incident in air at 55 degrees

A diverging lens has a focal length of 10 cm. Where is the image located when an object is placed 30 cm from the lens?

• 7.5 cm on the near side

• 15 cm on the near side

• 30 cm on the near side

• 7.5 cm on the far side

The concave spherical mirror of radius r shown above has focal point F and center of curvature C. An object is placed at a distance 2r from the mirror. Where will the image be formed?

• Between C and the object

• To the right of the object

• Between F and the mirror

• To the left of the mirror

• Between F and C

A physics student places an object 6.0 cm from a converging lens of focal length 9.0 cm. What is the magnitude of the magnification of the image produced?

• 0.6

• 2.0

• 3.6

• 3.0

• 1.5

An object is placed in front of a converging thin lens at a distance from the center of the lens equal to half the focal length. Compared to the object, the image is

• upright and smaller

• inverted and smaller

• upright and larger

• inverted and the same size

• inverted and larger

Which of the rays shown above is correct for this diverging mirror?

• 1

• 2

• 3

• 4