Light travels in a ___ path unless it interacts with an object.

Straight

True or False: Shadows are formed when light is completely absorbed by an object.

False. Shadows are formed when light is blocked by an object.

What is the principle behind the reflection of light in mirrors?

The principle of reflection states that the angle of incidence is equal to the angle of reflection when light hits a reflective surface.

Explain the environmental importance of energy-efficient lighting.

Energy-efficient lighting is crucial.

• Reduces energy consumption significantly.

• Lowers electricity bills for consumers.

• Decreases greenhouse gas emissions overall.

Fill in the blank: The Moon is classified as a ___ object because it reflects light from the Sun.

Non-luminous

True or False: Fireflies are an example of non-luminous objects.

False. Fireflies are luminous objects as they produce their own light through chemical reactions.

What are some examples of artificial light sources developed by humans?

Examples include incandescent bulbs, fluorescent tubes, and LED lamps.

Fill in the blank: LED lamps are known for being ___ and having a longer lifespan than traditional bulbs.

Energy-efficient

True or False: Light can bend around obstacles in everyday scenarios.

False; light does not bend around obstacles in everyday scenarios, it travels in a straight line.

Fill in the blank: A candle flame is visible through a ___ pipe but not a ___ one, demonstrating light's straight-line travel.

Straight; bent

Fill in the blank: Translucent materials allow light to pass through ___, resulting in diffused visibility.

Partially

True or False: Opaque materials can create faint shadows.

False. Opaque materials block light completely, forming the darkest shadows.

What are the three components required for shadow formation?

Three components create shadows.

• Light source emits illumination.

• Opaque object blocks light.

• Screen displays the shadow.