Match the columns: Column A Column B 1. A wooden piece (a) Form of energy 2. Frosted paper (b) Light travels in straight lines 3. Light (c) Shadow cast by heavenly bodies 4. Rectilinear propagation of light (d) Opaque object 5.Eclipse (e) Translucent object 6. Firefly (f) Natural source of light 7. Represented by a straight line (g) Luminous body 8. Sun (h) A ray of light

1-(d) The materials that do not allow light to pass through them are called opaque materials. A wooden piece is an example of an opaque object. 2-(e) The materials that partially allow light to pass through them are called translucent materials. Frosted paper is an example of a translucent object. 3-(a) Light is a form of invisible energy that gives the sensation of vision. It makes things visible. 4-(b) The property of light travelling in a straight line is known as the rectilinear propagation of light. 5-(c) Eclipse is the shadow cast by the heavenly bodies on each other. The shadow caused by heavenly bodies is called eclipse. 6-(g) The objects that emit their own light are known as luminous objects. The firefly is an example of a luminous object. 7-(h) A ray of light is always represented by a straight line. The ray of light that falls on a mirror is called incident ray, and the ray of light comes back after reflection is called a reflected ray. 8-(f) The sources of light that occur in nature are called natural sources of light. The sun is a natural source of light. Column A Column B 1. A wooden piece (d) Opaque object 2. Frosted paper (e) Translucent object 3. Light (a) Form of energy 4. Rectilinear propagation of light (b) Light travels in straight lines 5.Eclipse (c) Shadow cast by heavenly bodies 6. Firefly (g) Luminous body 7. Represented by a straight line (h) A ray of light 8. Sun (f) Natural source of light

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Science Success>Chapter 11 - Light, Shadows and Reflections>EXERCISES>Q C

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Ray of light is represented by a straight line.

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Important Questions on Light, Shadows and Reflections

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Science Success>Chapter 11 - Light, Shadows and Reflections>EXERCISES>Q C

The sun is a natural source of light.

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Science Success>Chapter 11 - Light, Shadows and Reflections>EXERCISES>Q C

An oiled paper is an example of a transparent body.

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Science Success>Chapter 11 - Light, Shadows and Reflections>EXERCISES>Q C

Any non-luminous body can be luminous by heating it.

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Science Success>Chapter 11 - Light, Shadows and Reflections>EXERCISES>Q C

Any material medium through which light energy can pass partially or wholly is called an optical medium.

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Science Success>Chapter 11 - Light, Shadows and Reflections>EXERCISES>Q C

Electric bulbs and lanterns are two natural sources of light.

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Science Success>Chapter 11 - Light, Shadows and Reflections>EXERCISES>Q C

Fireflies are luminous objects.

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Science Success>Chapter 11 - Light, Shadows and Reflections>EXERCISES>Q D

Match the columns:

Column A	Column B
1. A wooden piece	(a) Form of energy
2. Frosted paper	(b) Light travels in straight lines
3. Light	(c) Shadow cast by heavenly bodies
4. Rectilinear propagation of light	(d) Opaque object
5.Eclipse	(e) Translucent object
6. Firefly	(f) Natural source of light
7. Represented by a straight line	(g) Luminous body
8. Sun	(h) A ray of light