Plane & Curved Mirrors Exam

The focal length of a spherical mirror is _____ the radius of curvature of the mirror.

• twice

• half

• the same

• unrelated to

What type of image is produced by a convex mirror?

• enlarged (bigger) and real

• reduced (smaller) and virtual

• enlarged and virtual

• reduced and real

Light from a laser strikes a plane mirror at an angle of 38 degrees to the normal. If the angle of incidence increases by 13 degrees what is the new angle of reflection?

• 38 degrees

• 51 degrees

• 65 degrees

• 84 degrees

A concave mirror has a 7 cm focal length. You place a 2.4 cm tall object 16 cm from the mirror. Determine the image height.

 $HINT.\ use:\ \ \ x_i=\frac{fx_o}{x_o-f}\ \ \ \ \ \ and:\ \ \ \ \ \ \ \ \frac{h_i}{h_o}=-\frac{x_i}{x_o}\ \ \ \ \ \$  

• 7 cm

• 4 cm

• -1.9 cm

• -3.5 cm

Under which conditions does a concave mirror produce an enlarged virtual image?

• Never

• When the object is farther away than the focal point

• When the object is farther away than the radius of curvature

• When the object is between the focal point and the mirror

You place an object 20 cm in front of a convex mirror with a –15 cm focal length. Calculate the image position

 $HINT.\ Use\ the\ mirror\ equation:\ \frac{1}{f}=\frac{1}{x_i}+\frac{1}{x_o}$  

• 9.45 cm

• 5.34 cm

• -4.35 cm

• -8.57 cm

If xi = -xo, then what is the meaning of the negative sign?

• The image is inverted

• The image is virtual

• The image is smaller

• The image is larger

What is the size and position of an image formed by a plane mirror?

• same size, closer to the mirror

• same size, same distance away from the mirror

• enlarged, closer to the mirror

• reduced, farther from the mirror

Identify whether the following statement is true or false: “Virtual images are formed from divergent (scattered) rays.”

• True

• False

This is an example of a _________ mirror

• Concave

• Convex

• Magnifying

• Plane