Phone along the axis: distorted image (Example 9.2)अक्ष के अनुदिश रखा फ़ोन: विकृत प्रतिबिंब (उदाहरण 9.2)Phone along the axis: distorted image (Example 9.2)

NCERT Fig 9.7 · Class 12 Physics · Chapter 9 · interactive diagram

Parts and what they mean

• Concave mirror (अवतल दर्पण) — A reflecting surface that is part of a hollow sphere, silvered on the outside so it reflects from the inside (curved in towards the object). Converging.
• Principal axis (मुख्य अक्ष) — The line through the pole P and the centre of curvature C.
• Centre of curvature C (वक्रता केंद्र C) — Centre of the sphere of which the mirror is a part. PC = R. A ray through C hits the mirror along the normal and retraces its path.
• Principal focus F (मुख्य फोकस F) — Rays parallel to the axis meet here after reflection (concave) or seem to come from here (convex). PF = f = R/2.
• Mobile phone lying along the axis (अक्ष के अनुदिश रखा मोबाइल फ़ोन) — Its near end stands at C, its far end beyond C. Different parts are at different distances u.
• Image of the phone (फ़ोन का प्रतिबिंब) — Each point is imaged with its own m = −v/u, so the magnification is not uniform: the end at C keeps its size (m = −1), the far end becomes small. Computed point by point from the mirror equation.
• Two rays from the far top corner (दूर वाले ऊपरी कोने से दो किरणें) — Parallel ray → through F; ray through F → parallel. They meet at the image of that corner.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 9.7. Report a mistake