Light, G4

What are opaque objects?

• Objects that produce light.

• Objects that do not allow light to pass through them.

• Objects that allow some light to pass through them.

• Objects that allow light to pass through them.

Which of the following is a transparent object?

• Sunglasses

• Paper

• Clear glass

• Frosted glass

Which of the following is matched correctly?

• Air = Translucent

• Metal = Translucent

• Clear plastic = Transparent

• Wall = Opaque

Which of the following is true about translucent objects?

• They do not allow light to pass through them.

• They allow some light to pass through them.

• Water and clear plastic are translucent objects.

• Shadows are not formed when light shines on translucent objects.

A list of objects is given below.

• Milk
• Tracing paper
• Tinted glass
What is the common property of the objects above?

• We can see through the objects clearly.

• We can see through the objects blurredly.

• We cannot see through the objects.

• We can see dark shadows formed behind the objects.

Somsri carried out an activity to study if light can pass through object X. The
result is shown in the diagram.
Based on this activity, it shows that ____________.

• object X blocks the light in its path

• only some of the light passes through object X

• the light can pass through object X which is transparent

• the light is absorbed by object X

Why are some windowpanes made of frosted glass?

• Blocks the sunlight

• Enhances the beauty of the house

• is cheaper than other materials such as plastic

• Allows some light to pass through it without sacrificing privacy

Which of the following is true about a shadow?

• A shadow is formed only on a screen.

• A transparent object produces a shadow.

• A shadow is a dark area where light is blocked by an opaque object.

• The shadow of an object is formed on the same side of the light source.

Which of the following objects will form a shadow when shone by a torchlight?

• Mirror

• Beaker

• Glass bottle

• Clear plastic

The diagram below shows the observation of an activity.
What conclusion can be made from the activity?

• Light travels through all media.
  

• Light can pass through transparent objects.

• Light cannot pass through opaque objects.

• Some light can pass through translucent objects.