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 Form 2 Physics: Reflection at curved surfaces questions and answers

Figure 4 shows a bright electric lamp placed behind a screen which has a hole covered with a wire gauze. A concave mirror of focal length 25cm is placed in front of the screen. The position of the mirror is adjusted until a sharp image of the gauze is formed on the screen.
Determine the distance between the mirror and the screen.

 (2m 3s)
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