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Lesson: The Simple Magnifier

Sample Question Videos

Worksheet • 14 Questions • 1 Video


You view a mountain with a magnifying glass of focal length 𝑓 = 1 0 cm. What is the magnification?

  • A2.5x
  • B4.0x
  • C2.9x
  • D3.7x
  • E3.4x


What will be the angular magnification of a convex lens with the focal length 2.5 cm?

  • A11x
  • B16x
  • C10x
  • D15x
  • E13x


If the image formed on the retina subtends an angle of 3 0 ∘ and the object subtends an angle of 5 . 0 ∘ , what is the magnification of the image?

  • A 6 . 0 π‘₯
  • B 6 . 9 π‘₯
  • C 5 . 0 π‘₯
  • D 6 . 5 π‘₯
  • E 5 . 6 π‘₯


How far should you hold a 2.1-cm-focal length magnifying glass from an object to obtain a magnification of 10@x? Assume you place your eye 5.0 cm from the magnifying glass.


A magnifying glass produces an angular magnification of 4.5x when used by a person with a near point of 18 cm. What is the maximum angular magnification obtained with the lens by a person with a near point of 45 cm?

  • A9.8x
  • B9.5x
  • C8.5x
  • D9.3x
  • E8.8x


A magnifying glass forms an image 10 cm on the opposite side of the lens from the object, which is 10 cm away. What is the magnification of this lens for a person with a normal near point if their eye 12 cm from the object? The lens-to-retina distance is 2.00 cm.

  • A βˆ’ 2 . 1 x
  • B βˆ’ 3 . 3 x
  • C βˆ’ 1 . 6 x
  • D βˆ’ 2 . 9 x
  • E βˆ’ 2 . 5 x


A doctor examines a mole with a 10.0 cm focal length magnifying glass, which is held 12 cm from the mole. What magnification does the lens produce?


An object viewed with the naked eye subtends a 6 . 0 ∘ angle. If you view the object through a 10x magnifying glass, what angle is subtended by the image formed on your retina?


A magnifying lens with a focal length of 14.0 cm is held 4.00 cm from an eye and the object is 13.0 cm from the eye. What is the magnification of the lens?

  • A 10.7x
  • B 7.00x
  • C 12.3x
  • D 8.33x
  • E 9.25x


Find the angular magnification of an image by a magnifying glass of 𝑓 = 6.3 cm if the object is placed 𝑑 o = 5.8 cm from the lens and the lens is close to the eye.


A magnifying glass produces a magnification of 4.00 when held at a distance of 6.00 cm from a coin. What is the focal length of the magnifying glass?


What is the angular magnifier of a binocular that has a focal length of 1.9 cm for the eyepiece and a focal length of 9.0 cm for the objective?


You view an object by holding a 3.50 cm focal length magnifying glass 10.0 cm away from it. How far from your eye should you hold the magnifying glass to obtain a magnification of 10.0x?


While outdoors on a sunny day, a student holds a large convex lens of radius 5.0 cm vertically above a sheet of paper, producing a bright spot of light on the paper 2.0 cm in radius. The magnitude of the electric field within the bright spot of light is 𝐸  and that of the sunlight leaving the side of the lens facing the paper is 𝐸  . Find the ratio of 𝐸  to 𝐸  .