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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [3] medium thorough-understanding
An object is placed between the pole P and the principal focus F of a concave mirror. Using ray diagram rules, explain why the image formed cannot be caught on a screen.
Generated by claude-sonnet-4-6 · 2026-06-26 01:12 · grounding rag
Model Answer

When an object is placed between the pole (P) and the principal focus (F) of a concave mirror, the two reflected rays — one parallel to the principal axis and one passing through/directed toward the centre of curvature — diverge after reflection. These diverging rays do not meet in front of the mirror; they only appear to meet behind the mirror when extended backwards.

Since the reflected rays are diverging, no real point of intersection exists in front of the mirror. The image formed is virtual, erect, and enlarged, located behind the mirror. A screen can only catch a real image (where rays actually meet); because this image is virtual, it cannot be caught on a screen.

Source: Chapter 9, Section 9.2.1 & 9.2.2; Table 9.1

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Explanation
Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.