grade 4 , con 3, lesson 2

Light travels in lines in the form of waves.

• curved

• zigzag

• straight

• circular

When light rays hit an object, all the following sentences are correct, except

• some of this rays is absorbed by the object.

• some of this rays is bounced off the object.

• some of this rays may go through the object.

• all of this rays are absorbed by the object.

A shadow of an object is formed because

• light can pass through the object.

• light cannot pass through the object.

• this object is made of glass.

• this object is transparent.

Opaque material

• allows light to pass through.

• absorbs some of light that falls on it only.

• reflects some of light that falls on it only.

• absorbs some of light that falls on it and reflects the other.

All of the following are transparent objects, except

• water.

• paper.

• air.

Mirror causes falling light rays to

• pass through it.

• reflect at the same angle they strick the mirror.

• reflect in different directions.

• diffuse like that of rough surfaces.

Our eyes,

• can see through both opaque and transparent objects.

• cannot see through both opaque and transparent objects.

• can see through opaque objects, but not through transparent objects.

• can see through transparent objects, but not through opaque objects.

If there are two sheets, one is made of wood and the other is made of glass,

• you can see the glass sheet through the wood sheet.

• you cannot see the wood sheet through the glass sheet.

• you can see the wood sheet through the glass sheet.

• light can pass through both sheets.

Light rays can pass through lenses, so they are made up of

• wood.

• paper.

• glass.

• metal.