Physics

posted by .

1. A concave mirror forms a real image at 25cm from he mirror surface along the principal axis. If the corresponding object is at a 10cm distance, what is the mirror's focal length?
2. A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 28cm from the mirror, what is its focal length?

• Physics -

1. Learn the formula
1/Do + 1/Di = 1/f
Then use it.

In this case Do = object distance = 10 cm
Di = image distance = 25 cm.
Solve for f

2. Do = 28
Di = -56
The magnification is 2 = |Di/Do|
Di is negative for an upright image.
Solve for f
Use the same equation as part 1 to solve for f.

• Physics -

1. 14.2

Similar Questions

1. physics

1)A convex mirror of focal length 10 cm forms an upright and magnified image of a real object placed at a distance of 20 cm from the mirror. false 2)A concave mirror of focal length 10 cm forms an upright and diminished image of a …
2. Physics repost

1)A 5.0 cm real object is placed at a distance of 5.0 cm from a concave mirror of focal length 10 cm. Find the size of the image. di= -10 magnification = |di/do| magnification = |-10/5.0| magnification = 2 image size = (object size)*(magnification) …
3. physics

TRUE OR FALSE The virtual image formed by a convex mirror is always enlarged. A convex mirror never forms a real image of a real object. When the object of a concave mirror is inside the focal point, the image is virtual. The image …
4. physics

here is my problem: a concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. if the corresponding object is at a distance of 36.0 cm, what is the mirror's focal length?
5. physics

here is my problem: a concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. if the corresponding object is at a distance of 36.0 cm, what is the mirror's focal length?
6. physics

here is my problem: a concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. if the corresponding object is at a distance of 36.0 cm, what is the mirror's focal length?
7. physics

A concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. If the corresponding object is at ta distance of 36.0 cm, what isi the mirror's focal length?
8. physics

A person stands in front of a mirror at an amusement park. the person is left of a mirror. the mirror shows an upright image of the person that seems to be 4.0 meters behind the mirror. assume the image is 3.5 times the person's height. …
9. Physics

A candle flame is placed in front of a concave mirror on the principal axis such that is twice the size of the object and is inverted. If the sum of the object distance and the image distance is 72 cm, how far from the mirror is the …
10. physics

A light bulb is placed 16.6 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 5.40 cm closer to the mirror. Calculate the focal length of the concave …

More Similar Questions