For a magnifying glass, F is 24 cm from the lens. The magnifying glass is held 17 cm in front of a seashell.

Question

For a magnifying glass, F is 24 cm from the lens. The magnifying glass is held 17 cm in front of a seashell.

1.Calculate the location of the image and state its characteristics.

2.Determine the magnification of the magnifying glass.

Answer 1

When the glass is held at a distance from the object less than the focal length, the image is virtual, enlarged and upright.

1 1/d_i = 1/f - 1/d_o = 1/24 - 1/17 = -0.017. d_i = - 58.8 cm as image distance.

2 Magnification = - d_i/d_o = - -58.8 / 17 = + 3.46 larger and upright.