University of the Fraser ValleyPHYSICS 1975 Use the mirror and magnification equations to help you solve the word problems below

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University of the Fraser ValleyPHYSICS 1975

Use the mirror and magnification equations to help you solve the word problems below. Remember to rearrange the equation to isolate the variable you need to solve for. Always use the 5-step approach to solve the word problems!

 

1.            Determine the image distance in each of the following:

a)            A concave (converging) mirror has a focal length of 15 cm. An object is placed 40.0 cm from the mirror.

b)            An object is placed 10 cm from a concave (converging) mirror that has a focal length of 15 cm.

c)            A convex (diverging) mirror has a focal length of -20 cm. An object is placed 10.0 cm from the mirror.

d)            An object is placed 30 cm from a convex (diverging) mirror that has a focal length of -20 cm.

 

2.            A candle 3.0 cm tall is placed 30 cm from a concave (converging) mirror with a focal length of 20 cm. Using the equations, give quantitative characteristics about the image’s position from the mirror and its height. To conclude, LOST the image.

 

3.            A woman looks at herself in a magnifying (concave) mirror whose focal length is 20 cm. If her face is 10 cm from the mirror:

a)            at what distance from the mirror does her image form?

b)            how magnified is her face in the mirror?

 

4.            A 2.0 cm high candle is placed 15 cm in front of a concave mirror whose focal length is 30 cm.

a)            How far ‘behind’ the mirror does the candle appear?

b)            Can this image be projected onto a screen?

c)            How tall is the image that is produced?

d)            Is the image upright or inverted?

 

5.            Lisa Kelly from Ice road Truckers sees the image of a car passing her truck in her convex mirror. She’s bored: she wants to know the exact distance and height of the image that forms in her mirror. The focal length of her mirror is -60 cm, and she guesses the car is 1.5 m high and 6.0 away from her side mirror. Help her find the image’s distance and height based on these observations.

 

6.            A spherical, polished metal ball is used as a diverging mirror over a birdbath. Its focal length is -20 cm. A bird, 25 cm tall, standing 50 cm from the metal ball, looks directly at the metal ball.

a)            How far from the metal ball does the image form?

b)            What is the size of the image?