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

2 answers

(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.
Ignore my last paragraph about diverging lenses. A magnifying lens (the kind you were asked about) is never diverging.
Similar Questions
  1. Multiple Choice QuestionMalika looks at a beetle through a magnifying glass. Why does the beetle appear larger under the
    1. answers icon 1 answer
  2. Why does the frog appear larger under themagnifying glass? A. When light passes through a magnifying glass, it is reflected. B.
    1. answers icon 1 answer
  3. Malika looks at a beetle through a magnifying glass.Why does the beetle appear larger under the magnifying glass? A. Light that
    1. answers icon 1 answer
  4. Malika looks at a beetle through a magnifying glass.Why does the beetle appear larger under the magnifying glass? A. Light that
    1. answers icon 1 answer
more similar questions