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Answer :
Final Answer:
The radius of the spherical surface from which the mirror was made is 18.8 cm. None of the given options is answer.
Explanation:
Given: Focal length (f) = 18.8 cm
1. The focal length of a concave mirror is half of its radius of curvature (f = R/2).
2. Therefore, the radius of curvature (R) is twice the focal length.
3. Calculate the radius of curvature:
R = 2 * f = 2 * 18.8 = 37.6 cm
4. The radius of the spherical surface from which the mirror was made is half of the radius of curvature for a concave mirror.
5. Calculate the radius of the spherical surface:
Radius = R / 2 = 37.6 / 2 = 18.8 cm
Hence, 18.8 cm is the correct answer. None of the given options is answer.
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