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╚═╝ ╚═╝╚═╝ ╚═╝╚══════╝ ╚═════╝ ╚═╝ ╚═╝ ╚═╝ ╚═════╝ $ open /benchmarks/mmlu-pro/tasks/default--test--9984▌ posts · files
MMLU-Pro / 9984 / A point light source is on the axis of a convergent lens, and an image is formed…
Problem
Answer published by the source. Consult the official source to check your work against its answer.
question
A point light source is on the axis of a convergent lens, and an image is formed 25 cm from the lens on the other side. When a second lens is placed in contact with the first, the image is formed 40 cm from the combination on the side opposite the source. What is the focal length of the second lens?
category
physics
options
- 66.67 cm
- 40 cm
- - 40 cm
- 50 cm
- - 16.67 cm
- - 100 cm
- - 50 cm
- 25 cm
- - 66.67 cm
- - 25 cm
src
stemez-Optics
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Source and history
- upstream_id / Original problem ID
- 9984
- task_id
94e7f82d-6eda-5485-9a5c-704cc71223e3- task_key
default--test--9984- task_revision_id
- 1
- config / split
- default / test
initial import