We know that the focal length of the mirror in the experimental setup is equal to the difference between focus and the mirror. The attached figure shows the setup. So, the focal length of the concave mirror is 11.7 cm. Hence, this is the required solution.
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Step-by-step explanation:
We know that the focal length of the mirror in the experimental setup is equal to the difference between focus and the mirror. The attached figure shows the setup. So, the focal length of the concave mirror is 11.7 cm. Hence, this is the required solution.