Year 6 Science How we see: check-up and practice test questions

Method. Check the definition.

1. Check. A candle gives out its own light, but a book only reflects light.
   gives out light
2. Write the answer.
   candle

Check. A book reflects light from a source. ✓

Method. Recall the words.

1. Recall. The light that bounces off a mirror is the reflected ray.
   reflected ray
2. Write the answer.
   reflected ray

Check. The light that arrives is the incoming ray. ✓

Method. Read the row.

1. Read the row. The reflected angle is equal to the incoming angle, 30 degrees.
   30
2. Write the answer.
   30 degrees

Check. The angles are equal. ✓

Method. Read the table in section 8.3.

1. Read the row. The candle light goes straight to the eye.
   straight
2. Write the answer.
   straight to the eye

Check. No reflection is needed. ✓

Method. Read the table in section 8.3.

1. Read the row. The light goes from the lamp to the book, and then to the eye.
   book
2. Write the answer.
   from the lamp, to the book, then to the eye

Check. The book reflects light. ✓

Method. Read the table in section 8.4.

1. Read the row. The optic nerve carries signals to the brain.
   optic nerve
2. Write the answer.
   optic nerve

Check. The retina sends the signals. ✓

Method. Read the table in section 8.4.

1. Read the row. The lens focuses the light onto the retina.
   lens
2. Write the answer.
   lens

Check. The pupil is the opening. ✓

Method. Recall the pupil rule.

1. Recall. The pupil gets bigger in dim light.
   bigger
2. Write the answer.
   bigger

Check. A bigger pupil lets in more light. ✓

Method. Subtract.

1. Subtract. 12 minus 3 is 9.
   12 - 3 = 9
2. Write the answer.
   9

Check. 3 + 9 = 12. ✓

Method. Think about reflection.

1. Think about the mirror. A mirror reflects light.
   reflects
2. Think about the eye. The reflected light can enter the eyes, which is why it must be used carefully.
   enter the eyes
3. Write the answer.
   Accept any sentence that says the mirror reflects light that hits it, so the reflected light can enter the eyes.

Check. Reflected sunlight must never be aimed at eyes. ✓

Method. Check the definition.

1. Check the list. A candle gives out its own light; a book and the Moon reflect light.
   candle
2. Write the answer.
   candle

Check. The Moon reflects sunlight. ✓

Method. Think about the path.

1. Think about the lamp. The lamp gives out light.
   lamp
2. Think about the book. The book reflects this light into our eyes.
   reflects
3. Write the answer.
   Accept any sentence that says the book reflects light from the lamp into our eyes.

Check. Light goes source, object, eye. ✓

Method. Use the rule for reflection.

1. Use the rule. The reflected angle equals the incoming angle.
   equal
2. Write the angle. So the reflected angle is 45 degrees.
   45 degrees
3. Write the answer.
   45 degrees

Check. Both angles are measured from the normal. ✓

Method. Add the six angles.

1. Add the incoming angles. The incoming angles are 30, 45 and 60.
   135
2. Add the reflected angles. The reflected angles are also 30, 45 and 60, which add up to 135.
   135 + 135 = 270
3. Write the answer.
   270 degrees

Check. Each pair is equal. ✓

Method. Think about the Moon.

1. Think about the light source. The Sun is the light source for the Moon.
   Sun
2. Think about the reflection. The Moon reflects sunlight into our eyes, and does not give out its own light.
   reflects
3. Write the answer.
   Accept any sentence that says the Moon reflects light from the Sun, and does not give out its own light.

Check. Reflected light is what we see. ✓

Method. Read the description.

1. Read the description. Light from the candle goes straight to the eye, without reflection.
   straight
2. Write the answer.
   straight to the eye

Check. The candle is a light source. ✓

Method. Recall the eye parts.

1. Recall. The optic nerve carries signals from the retina to the brain.
   optic nerve
2. Write the answer.
   optic nerve

Check. The retina has light-sensitive cells. ✓

Method. Think about the pupil.

1. Think about the amount of light. A smaller pupil lets in less light.
   less light
2. Think about the retina. This protects the retina from too much light.
   protects
3. Write the answer.
   Accept any sentence that says a smaller pupil lets in less light, which protects the retina from too much light.

Check. The pupil controls the light entering the eye. ✓

Method. Read the safety table.

1. Read the table. Mirrors must never reflect sunlight into anyone's eyes.
   never
2. Write the rule. So the rule is never to reflect sunlight into someone's eyes.
   never reflect
3. Write the answer.
   Accept any rule that says never reflect sunlight into anyone's eyes, or never use a mirror to reflect sunlight.

Check. Sunlight is very strong. ✓

Method. Write the light sources as a fraction of the total.

1. Read the counts. There are 3 light sources out of 12 objects.
   3 of 12
2. Write the fraction. So the fraction is 3 out of 12.
   3 out of 12
3. Write the answer.
   3 out of 12

Check. 3 + 9 = 12. ✓