NCERT · Class 10 · Science · Light – Reflection and RefractionThe focal length of a spherical mirror is 20 cm. What is its radius of curvature?
Step-by-Step Solution
The radius of curvature (R) of a spherical mirror is twice its focal length (f). Formula: R = 2f. Given f = 20 cm, so R = 2 * 20 = 40 cm. Therefore, option C is correct.
Detailed Options Breakdown
Option : 10 cm
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Light – Reflection and Refraction.
Option 1: 20 cm
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Light – Reflection and Refraction.
Option 2: 40 cm (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 3: 30 cm
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Light – Reflection and Refraction.
💡 Study Guide: This question tests core syllabus concepts from Light – Reflection and Refraction. For formulas, key summaries, and mock exam reference guides, read the full Light – Reflection and Refraction Revision Notes.