Light, Shadows and Reflection Class 6 Notes – Quick Revision
Light enables us to see. Luminous objects such as the Sun, a flame or a glowing bulb produce their own light. Most other objects are visible because light from a source falls on them and some of that light is reflected into our eyes.
Updated for 2026–27: “Light, Shadows and Reflection” is a familiar Class 6 Science topic from the older NCERT sequence. The current NCERT Class VI Science book is Curiosity, where the chapter order has changed and this exact title is no longer retained as a standalone chapter. This page preserves the proven search topic while teaching the underlying science in a board-neutral way.
| Concept | Key idea |
|---|---|
| Luminous object | Produces its own visible light |
| Transparent material | Transmits most visible light so objects can be seen clearly through it |
| Translucent material | Transmits some light but scatters it, so details are not seen clearly |
| Opaque material | Does not transmit visible light through it |
| Shadow | A darker region formed when light is blocked |
| Reflection | Light bouncing from a surface |
| Pinhole camera | A simple device that forms an inverted image through a tiny opening |
Watch & Learn: English + Hindi Video Lessons
English: Light, Shadows and Reflections
This public Aasoka lesson explains sources of light, transparent/translucent/opaque materials, shadows, mirrors and reflection in a concise visual format.
हिंदी: प्रकाश, छायाएँ एवं परावर्तन
यह सार्वजनिक Magnet Brains Hindi Medium वीडियो कक्षा 6 के विद्यार्थियों के लिए प्रकाश, पारदर्शी-अर्धपारदर्शी-अपारदर्शी पदार्थ, छाया, पिनहोल कैमरा और परावर्तन का अध्याय परिचय देता है।
Sources of Light and Types of Materials
Visible light is the part of electromagnetic radiation that the human eye can detect. A luminous object produces its own visible light—for example the Sun, stars, a flame, a glowing bulb and some bioluminescent organisms. A non-luminous object does not produce visible light of its own; we see it when light from another source is reflected into our eyes.
A ray of light is an ideal straight line used in diagrams to show the direction in which light travels. A group of rays is called a beam.
- Transparent: transmits most visible light with little scattering, so objects can usually be seen clearly through it. Examples: clean glass and clear water.
- Translucent: transmits some light but scatters it, so objects are not seen clearly. Examples: frosted glass, tracing paper and some thin fabrics.
- Opaque: does not transmit visible light through the material. Examples: wood, metal and thick cardboard.
Real materials are not perfectly transparent or perfectly reflective, so these categories are useful descriptions rather than absolute rules.
How Shadows Are Formed
A shadow forms when an opaque or partly opaque object blocks light from reaching a surface. To observe a clear shadow we usually need a light source, an object and a surface such as a wall, floor or screen.
- The shape of a shadow depends on the shape and orientation of the object relative to the light.
- The size of a shadow changes when the distances between the light source, object and screen change.
- A shadow shows mainly an outline and relative darkness; it does not show the surface colours and details of the object.
- Shadows are not always equally dark. Multiple light sources or translucent objects can produce lighter or overlapping shadow regions.
Pinhole Camera
A pinhole camera is a simple light-proof box with a tiny opening on one side and a screen on the opposite side. Because light travels approximately in straight lines, rays from different parts of an object cross at the pinhole and form an inverted image on the screen.
- A smaller pinhole can make the image sharper but dimmer.
- A larger pinhole lets in more light but can make the image blurrier.
- The image can be seen on a translucent screen or inside a darkened box.
Eye safety: Never look directly at the Sun through a pinhole, lens, binoculars or telescope. A pinhole projection can be used only to project sunlight onto a separate screen without looking through the opening.
Mirrors and Reflection of Light
Reflection is the change in direction of light when it strikes a surface and returns into the same medium. Smooth polished surfaces such as mirrors produce orderly, or specular, reflection; rough surfaces also reflect light, but scatter it in many directions.
In a simple reflection diagram, the incoming ray is called the incident ray, the outgoing ray is the reflected ray, and the imaginary line perpendicular to the surface is the normal. The angle of incidence equals the angle of reflection.
Image Formed by a Plane Mirror
- The image is virtual, which means it cannot be captured on a screen.
- It appears upright.
- It is approximately the same size as the object.
- It appears the same distance behind the mirror as the object is in front of it.
- It shows lateral inversion: left and right appear exchanged.
A shadow and a mirror image are therefore different. A shadow is produced by blocking light, whereas a mirror image is produced by reflection.
5-Minute Light and Shadow Activities
- Material test: Shine a torch through clear plastic, tracing paper and cardboard. Classify them as transparent, translucent or opaque.
- Shadow size: Move an object closer to and farther from a torch and observe how the shadow changes.
- Mirror test: Place a pencil in front of a plane mirror and compare the apparent distance of the image with the object’s distance from the mirror.
- Pinhole model: With adult/teacher supervision, make a simple pinhole viewer using cardboard and tracing paper. Never use it to look directly at the Sun.
Quick Revision Checklist
- I can distinguish luminous and non-luminous objects.
- I can classify materials as transparent, translucent or opaque.
- I can explain the three things needed to observe a shadow.
- I know why a pinhole camera forms an inverted image.
- I can explain reflection from smooth and rough surfaces.
- I know the main characteristics of an image in a plane mirror.
Quick Self-Test
- Why can we see the Moon even though it is not luminous?
- Which type of material allows some light through but does not form a clear image?
- What happens to the image formed by a pinhole camera?
- What is the difference between a shadow and a mirror image?
- What does the law of reflection say about the angle of incidence and angle of reflection?
Answers: (1) It reflects sunlight. (2) A translucent material. (3) It is inverted. (4) A shadow forms when light is blocked; a mirror image forms by reflection. (5) The two angles are equal when measured from the normal.
Light, Shadows and Reflection FAQs
What is light for Class 6?
Visible light is electromagnetic radiation that our eyes can detect. It allows us to see luminous objects directly and non-luminous objects when light reflects from them.
Why is a shadow formed?
A shadow forms when an object blocks some or all of the light travelling toward a surface.
What type of image does a plane mirror form?
A plane mirror forms a virtual, upright image of approximately the same size as the object, appearing the same distance behind the mirror as the object is in front.
Is Light, Shadows and Reflection still Chapter 11 in current NCERT Class 6 Science?
No. The current NCERT Class VI Science book is Curiosity, and the chapter sequence has changed. This page retains the older search title because the concepts remain useful across boards and curricula.
Related Class 6 Science Learning
- Light, Shadows and Reflection – Questions & Solutions
- Electricity and Circuits Class 6 Notes
- Motion and Measurement of Distances Class 6 Notes
- Fun with Magnets Class 6 Notes
- Air Around Us Class 6 Notes
- Current NCERT Class VI Science textbook – Curiosity
Study tip: Instead of memorising definitions alone, draw one simple diagram each for shadow formation, a pinhole camera and reflection from a plane mirror. Visual reasoning makes this topic much easier to remember.
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