Question

can anyone pls help me saying this IV bit ans

Answer 1

Answer:

IV 1. Objects that cannot emit light energy by themselves are known as non-luminous objects. The luminous objects are visible as they emit light on their own.

2. Rectilinear propagation describes the tendency of Electromagnetic waves (light) to travel in a straight line. Light only deviates from a straight line when the medium it is travelling through changes density.

3. Sun and stars.

4. Lamps and bulb.

5. Moon is non-luminous body because it shines by reflecting the sunlight falling on it.

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Answer 2

Answer:

1.Objects that cannot emit light energy by themselves are known as non-luminous objects. ... The luminous objects are visible as they emit light on their own.

2.Rectilinear propagation describes the tendency of Electromagnetic waves (light) to travel in a straight line. Light only deviates from a straight line when the medium it is travelling through changes density. This is called refraction.

3.Natural sources of light include the sun, stars, fire, and electricity in storms.

4.Artificial light is created by humans. Flashlights, table lamps, neon signs, and televisions are some sources of artificial light.

5.Moon is non-luminous body because it shines by reflecting the sunlight falling on it.

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