If you are given a magnifying glass. What two methods could you use to find its focal length?

  1. 👍
  2. 👎
  3. 👁
  1. (1) measure the distance required to form an image of a very distance source (like the sun)

    (2) Use an optical bench and form the image of a light source. Measure both do and di and use the equation
    1/do + 1/di = 1/f

    These methods only work for positive lenses. If the lens is diverging, use the real image from another lens and place it on the opposite side of the diverging lens, so that it can form a real image. Then use the lens equation. f will turn out to be negative.

    1. 👍
    2. 👎
  2. Ignore my last paragraph about diverging lenses. A magnifying lens (the kind you were asked about) is never diverging.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions


    Given a scale factor of 2, find the coordinates for the dilation of the line segment with endpoints (–1, 2) and (3, –3). (1 point) A) (–2, 4) and (6, 6) B) (2, 4) and (6, 6) C)(–2, 4) and (6, –6) D)(2, –1) and (–3,

  2. math

    Which of these glasses contains more liquid? Glass A contains about twice as much as glass B Glass A contains about 20% more than glass B Glass A and B contain about the same amount Glass B contains about 20% more than glass A

  3. Language arts

    Read the text trailer for the short story “4102 Elm Street.” Strange noises. Weird odors. No one seen going either in or out. Andrew knew something strange was going on in the house across the street, and he was determined to

  4. math

    A glass is 1 4 full. Then 70cm3 of orange juice is poured in. The glass is now 3 5 full. What is the total volume of the glass?

  1. science

    What made the discovery of cells possible? A.the study of viruses and bacteria B. the use of magnifying glasses C. the invention of the microscope D.the observation of cells by Hooke and Pasteur I really need help on these I tried

  2. Geometry

    You set up a makeshift greenhouse by leaning a square pane of glass against a building. The glass is 4.5 ft long and it makes a 30 degree angle with the ground. How much horizontal distance between the building and the glass is

  3. Math

    Gina uses a magnifying glass to look at bugs. A caterpillar that is 2 inches long appears 4.5 inches long through the glass. What is the scale factor?

  4. Math

    A cylindrical juice glass is 8 centimeters tall and has a diameter of 6 centimeters. If the glass is ¾ full, find the volume of the juice in the glass.

  1. Physics, ray optics

    An astronomical telescope of magnifying power 7, consist of two thin lenses 40 cm apart in normal adjustment. Find the focal length of the lenses.

  2. Physics

    a ray of light strikes a flat, 2-cm thick block of glass(n=1.5) at an angle of 30 degrees with respect to the normal. find the angle of refraction at the top surface. find the angle of incidence at the bottom surface and the

  3. Math

    1. Given a scale factor of 2, find the coordinates for the dilation of the line segment with endpoints (–1, 2) and (3, –3). (1 point) (–2, 4) and (6, 6) (2, 4) and (6, 6) (–2, 4) and (6, –6) (2, –1) and (–3, 3) 2.

  4. Math

    Tracy made a stained glass jewellery box. It measured 20cm by 12cm by 8cm. a) About how much glass did Tracy use? b) one piece of glass has an area of 100 cm squared and costs $3.65. How much did the glass cost?(assume all pieces

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