YR2_T1_LSN10

• Science
• Middelbare school
• havo, vwo
• Leerjaar 2

Get ready:

Macbook:

• Kwizl
• Calculator

Textbook & Notebook closed.

Practice quiz on Kwizl:

• 8 min max practice quiz.
• 7 min max  peer review and feedback.
• 5 min max write a reflection in your notebook:
• What mistakes did I make?
• Why were they mistakes?
• What can I do better next time?

Homework check:

• Open the docs on Classroom
• Correct your hw in a different colour.
• Bring up your textbook and notebook when your name is called. 

YR2_T1_LSN10

Topic 1.4

Topic 1.4 - Learning Goals:

I can…

• Explain what the different parts of the electromagnetic spectrum are and where the different types of waves are found
• Label the different parts of the human eye and know the function of each part
• Understand the purpose of the rods and cones in the human eye
• Explain how the eyes lens bends to focus light, allowing us to see
• Explain what the problem is for people that are nearsighted or farsighted and which type of lens they need  

Topic 1.4 - Key Words:

• Accommodation
• Aqueous humor
• Cones
• Cornea
• Farsighted
• Impulses
• Iris
• Lens
• Light

• Nearsighted
• Negative lens
• Optic nerve 
• Positive lens
• Pupil
• Retina
• Rods
• Sclera
• Vitreous body

1.4 - Electromagnetic spectrum:

Light is a form of energy that travels in waves

The whole spectrum spans a range of waves and frequencies

Part we can see: visible part of the spectrum

Part we cannot see: infrared and ultraviolet part of the spectrum

1.4 - Electromagnetic spectrum:

1.4 - Eyes are the detectors of light:

iris

sclera

pupil

lens

optic nerve

retina

cornea

1.4 - Eyes are the detectors of light:

1.4 - Eyes are the detectors of light:

1.4 - How do you see light?

Light reacts to cells in the retina.

The cells react to light and send impulses, messages, to your brain

Two different types of cells:

• Rod cells give information on contrast, the black and white picture
• Cone cells give information on color: red, green and blue

1.4 - Accomodation:

Accommodation: the lens changes its shape in order to see objects sharply from both far away and nearby

Myopia ⇒ nearsighted

You can see object nearby

Far away objects are not sharp

Hyperopia ⇒ farsighted

You can see objects far away

Nearby objects are not sharp

1.4 - Nearsighted & Farsighted: