Class 6 Science: Light, Shadows and Reflections

A shadow is not a thing stored inside an object: it is a region where light from a source is blocked. This simple idea explains familiar patterns from a torch beam to a sundial.

What to understand

Describe the central idea in your own words.
Use a model, observation or relationship to explain a changed example.
Notice and correct the likely misconception in the worked reasoning.

A light-path model

Light travels from a source to an object and then to an eye or screen. A shadow needs a source, an object that blocks light and a surface on which the blocked region can be seen.

Move the torch closer to the object: the shadow usually becomes larger because the object blocks a wider bundle of rays at the screen. A mirror does not create light; it changes the direction of incoming light by reflection.

Worked reasoning: Draw three rays from a torch to the edge of a book and continue them to a wall. The region behind the book receives less direct light. A transparent sheet may transmit enough light to make a faint shadow, while an opaque book makes a dark one.

Try, explain and check

Prediction

What happens to shadow size when the object moves toward the torch?

Show a reasoning prompt

State the evidence, relationship or model that supports your answer, then check whether the units and direction make sense.

Observation

Test the prediction with a torch, a book and a wall. Keep the wall fixed and change one distance at a time.

Show a reasoning prompt

State the evidence, relationship or model that supports your answer, then check whether the units and direction make sense.

Explanation

The result is strongest when the blocked rays spread before reaching the screen.

Show a reasoning prompt

State the evidence, relationship or model that supports your answer, then check whether the units and direction make sense.

Next step

Write a three-sentence revision summary, then continue to the related resource. For extra practice, visit the resource library and choose a worksheet that matches the skill you need.

About this resource
Prepared as part of the BIS Quiz learning resource. It is supplementary study material; use your teacher's instructions and prescribed materials when they differ. Report a factual error or unclear explanation.