About the Convex Lens Practical: Image Distance for Different Object Distances simulation
The CBSE Class 10 practical “to find the image distance for varying object distances in the case of a convex lens with ray diagrams”, on an online optical bench simulation: a candle, a convex lens at the 50 cm mark and a white screen.
Put the candle beyond 2F, at 2F, between F and 2F, at F and inside F. For each, slide the screen until the flame is sharp — the picture blurs with the real amount of defocus — and read both pointers to the 1 mm least count. At F no position gives a sharp image, and inside F you look through the lens to see the virtual image. The ray diagram for every case is drawn beside the bench.
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