شرح ساينس الصف الرابع الابتدائي لغات - الفصل الدراسي الأول
شرح ساينس رابعة ابتدائي - ترم أول

لينك تحميل الملزمة
https://drive.google.com/file/d/1VSOXtnwqGPU6EBXXVQU9ya_nyfXESEsZ/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This lesson:
Do you know what is the organ that is affected by light in humans and animals and how they can see things in low-light places?

• The eye is the sense organ of sight that is affected by light in humans and animals.

• Humans need more light in low-light places to see clearly.

• Some animals such as fishing cat can see better than humans in the low-light places


Night vision in humans:
• Human eyes need more light to see well in the low-light places
• Without more light humans would need a device known as
"Night vision goggles" to see in the dark.

Night vision in animals:
The structure of eyes of some animals help them see in the dark such as the fishing cat.
The fishing cats.
- It is a wild cat and considered as one of nocturnal animals that hunts for food at night.
- The fishing cat's eyes seem to glow in the dark because:
1- It has a mirror-like membrane at the back of its eyes.
2- When the light enters the fishing cat's eyes, it bounces (reflects) off this membrane, allowing its eyes to collect more light.
- This structural adaptation of the fishing cat’s eyes is found in all cats and allow them to have excellent night vision to hunt in the low-light places.
The ability of humans and nocturnal animals to see in the dark :

Sources of light


There are other objects that don't emit their own light, but they reflect the light falling on them, so they are not considered as sources of light such as:

How we see
- When the source of light emits its own light rays they fall on objects, the light rays bounce off these objects and reach our eyes, so we can see these objects, as shown in the picture below:


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