1) 1. What is the main objective of this experiment? a) a) To study reflection of light b) b) To study scattering of light c) c) To study the shadow formed by a point source of light d) d) To study refraction of light 2) 2. What acts as the point source of light in this experiment? a) a) A torch b) b) The Sun c) c) A candle or a small electric bulb d) d) A fluorescent tube 3) 3. What material is used as the opaque object in this setup? a) a) A glass ball b) b) A small ball (opaque) c) c) A mirror d) d) A transparent sheet 4) 4. Where is the screen placed? a) a) Next to the light source b) b) About 1 meter away from the light source c) c) Behind the ball d) d) Between the ball and light source 5) 5. What type of shadow is formed by a point source of light? a) a) Penumbra b) b) Partial shadow c) c) Umbra (a single, dark, uniform shadow) d) d) Diffused shadow 6) 6. . What do the rays OP and OQ in the diagram represent? a) a) Reflected rays b) b) Refracted rays c) c) Boundary rays that define the edges of the shadow d) d) Scattered rays 7) 7. Why does the region AB on the screen appear dark? a) a) Light bends around the object b) b) Light passes through the ball c) c) Light is completely blocked by the opaque object d) d) The ball reflects the light 8) 8. What is the name given to the completely dark region of a shadow? a) a) Umbra b) b) Penumbra c) c) Diffraction zone d) d) Reflection zone 9) 9. What is the nature of the edges of the shadow formed by a point source? a) a) Sharp and well-defined b) b) Blurred c) c) Faint d) d) Invisible 10) 10. What conclusion can be drawn from this experiment? a) a) A point source of light forms a single, sharp, dark shadow (Umbra) of an opaque object. b) b) A point source of light produces no shadow. c) c) Light bends around obstacles. d) d) The shadow has both dark and bright regions.

JKC Std VII Experiment 20: Shadow obtained from a Point Source and an Extended Source

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