1 - If the object (pencil) is 15 cm long, what is its angular size? Object angul

Question

1 - If the object (pencil) is 15 cm long, what is its angular size?

Object angular size: 1 (enter units of degrees or radians)

Object angular size: 1 (enter units of degrees or radians)

2 - If the mirror is flat, the angular size of the image is

2 times the angular size of the object. the same as the angular size of the object.     1/2 the angular size of the object. 1/3 the angular size of the object. 1/4 the angular size of the object. None of the above 2 times the angular size of the object. the same as the angular size of the object.     1/2 the angular size of the object. 1/3 the angular size of the object. 1/4 the angular size of the object. None of the above 2 times the angular size of the object. the same as the angular size of the object.     1/2 the angular size of the object. 1/3 the angular size of the object. 1/4 the angular size of the object. None of the above

3 - Where is the image located if the mirror is flat?

20 cm in front of the observer 40 cm in front of the observer     60 cm in front of the observer 80 cm in front of the observer 100 cm in front of the observer None of the above 20 cm in front of the observer 40 cm in front of the observer     60 cm in front of the observer 80 cm in front of the observer 100 cm in front of the observer None of the above 20 cm in front of the observer 40 cm in front of the observer     60 cm in front of the observer 80 cm in front of the observer 100 cm in front of the observer None of the above

4 - Where could the image be located if the mirror is convex?

20 cm in front of the observer 40 cm in front of the observer     60 cm in front of the observer 80 cm in front of the observer 100 cm in front of the observer None of the above 20 cm in front of the observer 40 cm in front of the observer     60 cm in front of the observer 80 cm in front of the observer 100 cm in front of the observer None of the above 20 cm in front of the observer 40 cm in front of the observer     60 cm in front of the observer 80 cm in front of the observer 100 cm in front of the observer None of the above

5 - If the observer sees an image that has same angular size as the object and is inverted then the mirror is

Flat Concave with a radius of curvature equal to 40 cm     Concave with a radius of curvature equal to 20 cm Convex with a radius of curvature equal to 40 cm Convex with a radius of curvature equal to 20 cm Flat Concave with a radius of curvature equal to 40 cm     Concave with a radius of curvature equal to 20 cm Convex with a radius of curvature equal to 40 cm Convex with a radius of curvature equal to 20 cm Flat Concave with a radius of curvature equal to 40 cm     Concave with a radius of curvature equal to 20 cm Convex with a radius of curvature equal to 40 cm Convex with a radius of curvature equal to 20 cm

6 - If the observer sees an image that is upright then the mirror is

Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex

7 - If the observer sees an image that moves to the left when the observer's eye moves to the right then the mirror is

Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex

8 - If the observer sees an image that has |M| < 1 then the mirror is

Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex

9 - If the observer sees an image that has |M| > 1 then the mirror is

Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex Flat Concave     Convex Flat or convex Flat or concave Flat, concave or convex Concave or convex

Explanation / Answer

Number 1)

Angular size is s/r

15/20 = .75 radians which is 43 degrees

Number 2)

The image will be 60 cm away

15/60 = .25 radians which is 14.3 degrees

Number 3)

The image is 20 cm behind the mirror if it is flat

Number 4)

If the mirror is convex, the image is located somewhere in back of the mirror. The exact location would depends on the focal length

Number 5)

The mirror would be concave and would produce a real image at the exact location of the object

Number 6)

Convex or Flat (An upright image will be behind the mirror. Both flat mirror and a convex mirror produce images in back of the mirror0

Number 7)

Convex or Flat (again, the image would have to be behind the mirror)

Number 8)

Convex or Concave - A virtual image in a convex mirror is diminished in size and a real inverted image of a concave mirror can also be diminished in size

Number 9)

Concave - A virtual image of a concave mirror will produce a larger image   

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