Revision

What is short-sightedness?

• Can see near object, far object is blurry

• Can see far object, near object is blurry.

Answer explanation

Sight means see, short sightedness means can see far away

How to correct short sightedness?

• concave lens

• convex lens

Answer explanation

Concave lens diverge the light ray so image can be focused on the retina.

Draw short-sightness based on one of the causes.

Draw short-sightedness with its corrective measure.

What is long-sightedness?

• can see near object clearly, far object is blurry

• can see far object clearly, near object is blurry

Answer explanation

Sight means see, long sightedness means can see far away

How to correct long sightedness?

• Concave lens

• Convex lens

Answer explanation

Convex lens converge the light ray so image can be focused on the retina.

Draw long-sightedness based on one of the causes.

Draw long-sightedness with its corrective measure.

The image shows what type of tropism?

• Positive phototropism

• Positive geotropism

• Negative phototropism

• Positive hydrotropism

which part of the plant shows positive phototropism?