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Objects that produce their own light are called Luminous Objects. Example, Sun, Fire
Objects that do not produce their own light but are visible when reflect light falling on them are called Non-Luminous Objects. Example - Table, planets. Non-luminous objects can be classified as-
Shadows are dark regions formed when an opaque object blocks the path of light. This formation is possible only because light only travels in a straight line.
Step 1: Take two cardboard boxes one larger than the other such that one box slides into the other without any gap.
Step 2: Cut out open one side of each box. On the opposite side of the larger box cut a small hole in the centre.
Step 3: On the opposite side of the smaller box cut a square of about 5 cm and cover this open area with a tracing paper.
Step 4: Slide the smaller box inside the larger one such that the side with the tracing paper is on the inside.
Step 5: Cover the camera and your head with a black cloth and then get ready to observe the distant objects.
Fig: A Pinhole Cameria
It is a simple camera with a small aperture and forms an inverted image of the object.
All of us are used to seeing a mirror every day. The image that we see in a mirror is called Reflection. The mirror deflects the direction of the light that falls upon it.
Fig: A Mirror Changing the direction of light as it falls on it
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