Please help! Lens L 1 in the figure below has a focal length of 14.1 cm and is l

Question

Please help!

Lens L1 in the figure below has a focal length of 14.1 cm and is located a fixed distance in front of the film plane of a camera. Lens L2 has a focal length of 13.3 cm, and its distance dfrom the film plane can be varied from 5.00 cm to 10.0 cm. Determine the range of distances for which objects can be focused on the film.

Lens L1 in the figure below has a focal length of 14.1 cm and is located a fixed distance in front of the film plane of a camera. Lens L2 has a focal length of 13.3 cm, and its distance d from the film plane can be varied from 5.00 cm to 10.0 cm. Determine the range of distances for which objects can be focused on the film. Objects can be focused on the film from m to m.

Explanation / Answer

1/13.3 = 1/5 + 1/Image1: D = 5 cm

note image1 calculates to a negative number for D=5 = -8.012

Image2 = 12 - D - Image1 => distance from L1 to image

=12-5-+8.012=15.012

1/14.1 = 1/image2 + 1/image3

Image3 for D=5; 232.09.

1/13.3 = 1/10 + 1/Image1: D = 10 cm

note image1 calculates to a negative number for D=10; = -40.3

Image2 = 12 - D - Image1 => distance from L1 to image

=12-10+ 40.3 =42.3

1/14.1 = 1/image2 + 1/image3

Image3 for D=10; 21.15

D = 5, Image 3 = 232.09 cm
D = 10 Image3 = 21.15 cm

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