Light Shadows and Reflections Class 6th Question Answers

Light Shadows and Reflections is Chapter 11 taken from JKBOSE Class 6 Science. You will get short notes and question answers in the chapter Motion and Measurement of Distances in this post. The previous post was about Chapter 10 Motion and Measurement of Distances Question Answers. Let’s begin:

Light Shadows and Reflections Class 6th Question Answers

Overview of Chapter

• TRANSPARENT, OPAQUE AND TRANSLUCENT OBJECTS
• WHAT EXACTLY ARE SHADOWS?
• A PINHOLE CAMERA
• MIRRORS AND REFLECTIONS

Light is an important form of energy which enables us to see many things around us. When light rays reflected from an object reach our eyes we can see any object. The objects which emit light on their own are called luminous objects like stars, sun, torches or bulbs etc. and the objects that do not have their own light are called non-luminous objects like chairs, tables, the moon etc.

TRANSPARENT, OPAQUE AND TRANSLUCENT OBJECTS: The objects which allow the light to pass through them completely are called transparent objects like glass, air, water etc.

The objects which do not allow light to pass through them are called opaque objects like a notebook, cardboard and book etc. When an opaque object comes in the path of light a shadow is formed.

The objects which allow the light to partially pass through them are called translucent objects. It only allows some of the light rays to pass through it like butter paper, wax paper, oil paper, greased paper etc.

WHAT EXACTLY ARE SHADOWS? When an object is placed in front of a source of light. It produces a shade (dark area) behind it. The shade cast by an object is called its shadow. Shadows are formed when light is stopped by an opaque object.

A PINHOLE CAMERA: A device which forms a photograph on a screen is known as a pinhole camera. The pinhole camera works on the principle that light travels in a straight line.

MIRRORS AND REFLECTIONS: An object which reflects light well is called a mirror. A plane mirror is a thin, flat and smooth sheet of glass with a shiny coating of silver metal on one side. The process of sending back the light rays which fall on the surface of an object is called the reflection of light.

Light, Shadows and Reflections Class 6 Questions

Exercises

1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.

Ans.

2. Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:

Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon.

Ans. Opaque Objects: A piece of rock, a sheet of aluminium, a wooden board, a CD, a wall, a sheet of cardboard, a sheet of carbon paper, a mirror, or an umbrella.

Transparent Objects: Air, water, a sheet of plane glass, a sheet of cellophane.

Translucent Objects: A sheet of polythene, smoke, fog, a wire mesh.

Luminous Objects: A piece of red-hot iron, a lighted fluorescent tube, a flame of a gas burner, a lighted torch, a kerosene stove, a sun, a firefly.

Non-Luminous Objects: A piece of rock, a sheet of aluminium, a wooden board, a wall, a sheet of cardboard, moon, air, water, mirror, polythene, CD, smoke, plane glass, fog, an umbrella, carbon paper, cellophane, wire mesh.

3. Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?

Ans. Yes, the cylindrical object if held vertically in front of a source of light (candle) gives a shadow which is rectangular in shape but if held horizontally gives a circular shadow.

Ans.

4. In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?

Ans. The process of reflection takes place in presence of light. In a completely dark room, there is no source of light so we will not see our reflection in the mirror.

That’s all about Light, Shadows and Reflections Class 6th Question Answers. Hope it has helped. Do share your views about this post in the comment section below.