What role does light play in our ability to see objects around us?

Light allows our eyes to perceive the world by illuminating objects, making them visible.

Fill in the blank: When it's dark, we cannot see anything, but when light is introduced, we can see the ___ and ___ around us.

Colors and shapes

True or False: Light is not essential for vision.

False. Light is essential for vision as it enables us to see objects.

Riddle: I am invisible but make everything visible, I can be turned on and off with a switch. What am I?

Light

What are the primary natural sources of light during the day?

The Sun is the primary natural source of light during the day.

Fill in the blank: Luminous objects are those that ___ light.

Emit

True or False: The Moon and Stars are considered luminous objects.

True

What is the role of artificial sources of light indoors?

Artificial sources like electric bulbs and candles provide light when natural sources like sunlight are not available.

Fill in the blank: Non-luminous objects do not produce their own light; examples include a ___ and a ___.

Table and a book

Identify two examples of artificial sources of light created by humans.

Electric bulbs and candles.

Why is light important indoors?

Light is important indoors because it allows us to see and perform tasks in the absence of sunlight.

Light travels in ___ lines, creating thin beams of rays.

Straight

What causes shadows to form?

Shadows are formed when objects block the path of light, preventing light from passing through.

Shadows are longest in the ___ and ___ when the sun is low on the horizon.

Morning and evening

True or False: Shadows are always the same length throughout the day.

False. Shadows change length depending on the position of the sun in the sky.

In the afternoon, shadows are generally ___ due to the higher position of the sun.

Shorter

What are three properties of shadows?

Shadows mimic the shape of the object, can vary in size, and always appear on the opposite side of the light source.

Riddle: I can be long or short, but I am always behind you when the light shines bright. What am I?

A shadow

Transparent substances allow light rays to pass through them ___.

Clearly

Fill in the blank: Shadows are always ___ in color.

Black

Transparent glass is primarily used in ___ to allow sunlight to enter.

Window panes

What materials are commonly used to make spectacles for clear vision?

Transparent glass or plastic

Translucent materials allow light to pass through them ___.

Partially