Physics

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?

  1. 👍
  2. 👎
  3. 👁
  1. 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.

    1. 👍
    2. 👎
  2. 1. 14.2

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    A convex spherical mirror has a focal length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image located? Answer 12 cm in front of the mirror 60 cm behind the mirror 60 cm in front

  2. physics

    A 4.5 cm tall object is placed 20 cm in front of a spherical mirror. It is desired to produce a virtual image that is upright and 3.5 cm tall. (a) What type of mirror should be used? concave mirror convex mirror (b) Where is the

  3. physics

    A 5.0-cm real object is placed at a distance of 30.0 cm from a concave mirror of focal length 10.0 cm. Find the location of the image. A. 6 cm B. 10 cm C. 15 cm D. 60 cm Is it B. 10 cm? Which of the following objects can set fire

  4. physics

    1)A 5.0 cm real object is placed at a distance of 30.0 cm from a concave mirror of focal length 10.0 cm. Find the location of the image. (30)(10)/5.0 15 or (30)(5.0)/10 60 I don't know which one 2)What must be the minimum height

  1. Physics

    The focal length of a concave mirror that produces four times larger real image of an object held at 5cm from the mirror is.....

  2. physics

    An object with a height of 42 cm is placed 1.6 m in front of a concave mirror with a focal length of 0.45 m. Find the location and magnification of the image produced by the mirror, using the mirror and magnification equations.

  3. physics

    a concave shaving mirror is construction so that a man at a distance of 20cm from the mirror sees his image magnified 1.5 times what is the radius of curvature of the mirror?

  4. physics

    A concave spherical mirror has a radius of curvature 15 cm. A 1 cm tall bulb is placed in front of the mirror such that its image is formed 10 cm in front of the mirror. If you measure distance from the optic center of the mirror,

  1. Physics

    What is the nature of an image formed by a concave mirror of focal length 10 cm for a real object placed 3 cm from the mirror real and inverted real and upright virtual and inverted virtual and upright Would it be virtual and

  2. Physics

    a thimble is 32.0 cm from a spherical concave mirror. The focal point lenght of the mirror is 11.0 cm. What is the image position?

  3. physics

    the focal length of this mirror is 6 cm and the object is located 8 cm away from the mirror. calculate the position of the image formed by the mirror. suppose the converging mirror is replaced by a diverging mirror with the same

  4. physics!

    The image produced by a concave mirror is located 27 cm in front of the mirror. The focal length of the mirror is 13 cm. How far in front of the mirror is the object located?

You can view more similar questions or ask a new question.