Match the statements in Column A with those in Column B. Column A Column B 1 . An optical medium which has different composition at different points (a) 3 × 10 8 m / s 2 . A body which does not allow light to pass through it. (b) Ray of light 3 . The speed of light (c) Luminous 4 . The path along which light energy travels in a given direction. (d) Opaque 5 . A body emitting light on its own. (e) Heterogeneous

An optical medium which has different composition at different points - Heterogenous An optical medium which has different composition at different points is called heterogeneous medium. A body which does not allow light to pass through it - opaque Those bodies which do not allow the light energy to pass through them are called opaque bodies. The speed of light - 3×10 8 m/s The speed of light is the distance light can travel in a unit of time through a given substance. The path along which light energy travels in a given direction - Ray of light The path along which light energy travels in a given direction is called a ray of light. A body emitting light on its own - Luminous All bodies which emit light energy by themselves are called luminous bodies. Column A Column B 1 . An optical medium which has different composition at different points (e) Heterogeneous 2 . A body which does not allow light to pass through it. (d) Opaque 3 . The speed of light (a) 3 × 10 8 m / s 4 . The path along which light energy travels in a given direction. (b) Ray of light 5 . A body emitting light on its own. (c) Luminous

Match the following: Column I Column II (a) A body that allows light to pass through it (i) Translucent material (b) A sheet of red cellophane (ii) Non-luminous object (c) Bouncing back of light from a surface (iii) Luminous body (d) A body emitting its own light (iv) Reflection (e) Moon (v) Transparent body

(a) A body that allows light to pass through it - (v) Transparent body These objects let the light to pass through them and form no shadow. (b) A sheet of red cellophane - (i) Translucent material The translucent object partially allows light to pass through them. (c) Bouncing back of light from a surface - (iv) Reflection The process of sending back the light rays which fall on the surface of an object is called the reflection of light. A plane mirror reflects almost all the light which falls on it. This means that a plane mirror changes the direction of light that falls on it. (d) A body emitting its own light - (iii) Luminous body Objects which emit their own light are known as luminous objects. They can be seen even in the dark as they give out their own light. They can be either natural or artificial. (e) Moon - (ii) Non-luminous object The objects that do not emit their own light are called non-luminous objects. Moon is an example of this. It only reflects the light coming from the sun. Column I Column II (a) A body that allows light to pass through it (v) Transparent body (b) A sheet of red cellophane (i) Translucent material (c) Bouncing back of light from a surface (iv) Reflection (d) A body emitting its own light (iii) Luminous body (e) Moon (ii) Non-luminous object

EASY

Earn 100

Describe different types of beams of light.

Important Questions on Light, Shadow and Reflection

EASY

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

State whether the following statement is true or false.

Gold is a translucent metal.

MEDIUM

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

Differentiate between luminous and non-luminous objects.

MEDIUM

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

Match the statements in Column A with those in Column B.

Column A	Column B
$1 .$ An optical medium which has different composition at different points	(a) $3 \times 10^{8} m / s$
$2 .$ A body which does not allow light to pass through it.	(b) Ray of light
$3 .$ The speed of light	(c) Luminous
$4 .$ The path along which light energy travels in a given direction.	(d) Opaque
$5 .$ A body emitting light on its own.	(e) Heterogeneous

MEDIUM

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

Why is it not safe to see the sun directly?

EASY

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

Circle the sources of light from the following objects.

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MEDIUM

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

Give two examples of non-luminous objects.

MEDIUM

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

You are given a sheet of transparent glass and a piece of wood. Which of them will cast a shadow when placed in front of a source of light? Justify.

EASY

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

Suggest two ways of converting transparent plastic sheet into translucent sheet.

MEDIUM

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

Write the sources of light.

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EASY

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

Does the flame of gas stove emit light? Explain.

EASY

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

What is the main source of light on Earth?

HARD

Science>Physics>Light, Shadow and Reflection>General Terms in Optics

Match the following:

Column I	Column II
(a) A body that allows light to pass through it	(i) Translucent material
(b) A sheet of red cellophane	(ii) Non-luminous object
(c) Bouncing back of light from a surface	(iii) Luminous body
(d) A body emitting its own light	(iv) Reflection
(e) Moon	(v) Transparent body