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7. Activity : Hold a concave mirror in your hand and direct it towards the screen. Direct the light reflected by the mirror on to a sheet of paper held close to the mirror. Move the sheet back and forth slowly until a bright, sharp spot of light is seen on the paper.24-Sep-2016.
9. Steps To Make a Solar Cooker. Fold the top pads closed on the larger box and place the inner box on top and drop a line everywhere it onto the top of the larger box. Remove the smaller box & cut end to end to make a hole in the top of the larger box. Maintain I inch space between these two boxes.
10. The sign conventions that are followed in case of refraction of light through spherical lenses are as follows:
1. All the distances are measured from the optical centre of the lens.
2. All the distances which are measured in the same direction of the incident light ray will be taken as positive.
3. All the distance which are measured against the direction of incident light are taken as negative.
4. The perpendicular distances to principal axis in upward direction will be positive and those in downward direction will be taken as negative.
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