Question

Q1. Name one living thing which emits light?


Q2. What could be the shape of the shadows?


Q3. Does the color of opaque object affect the color of the shadow?


Q4. When shadow cannot be formed?


Q5. Does the flame of gas stove emit light? Explain.​

Answer 1

Answer:

• Bioluminescence is the production and emission of light by a living organism. It is a form of chemiluminescence. Bioluminescence occurs widely in marine vertebrates and invertebrates, as well as in some fungi, microorganisms including some bioluminescent bacteria, and terrestrial arthropods such as fireflies.
• Shadows give us some information about shapes of objects. Sometimes, shodows can also mislead us about the shape of an object. ... If the curved surface of the cylinder is placed perpendicular to the path of the light, the shape of the shadow obtained is a rectangle.
• Shadow is the dark area behind any opaque object where the light cannot pass through. The colour of an opaque object doesn't affect the colour of the shadow.Shadows are always formed on the opposite side. Transparent objects cannot form a shadow. They are only formed in opaque or translucent objects. If we take a glass slab, no shadow is formed because it allows light to pass through it.
• Yes, It emits light. ... In gas stove complete combustion of the fuel occurs hence most of the energy is converted to heat energy and not light, so a very light blue colour flame is observed.

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Answer 2

Answer:

1 .Bioluminescence

2..Shadows give us some information about shapes of objects. Sometimes, shodows can also mislead us about the shape of an object. ... If the curved surface of the cylinder is placed perpendicular to the path of the light, the shape of the shadow obtained is a rectangle.

3..Shadow is the dark area behind any opaque object where the light cannot pass through. The colour of an opaque object doesn't affect the colour of the shadow.

4 If we take a glass slab, no shadow is formed because it allows light to pass through it.

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