Refraction Lenses Sight Refraction The change in direction
- Slides: 23
Refraction, Lenses, & Sight
Refraction • The change in direction of a wave as is crosses the boundary between two media in which the wave travels at different speeds.
Index of Refraction
Snell’s Law
Index of Refraction
Dispersion • The separation of light into colors arranged according to their frequency, by interaction with a prism or diffraction grating.
Rainbows • White light separates into different colors (wavelengths) on entering the raindrop because red light is refracted by a lesser angle than blue light. On leaving the raindrop, the red rays have turned through a smaller angle than the blue rays, producing a rainbow.
Lenses
Converging Lens
Rules For Converging Lenses 1) Any incident ray traveling parallel to the principal axis of a converging lens will refract through the lens and travel through the focal point on the opposite side of the lens. 2) Any incident ray traveling through the focal point on the way to the lens will refract through the lens and travel parallel to the principal axis. 3) An incident ray which passes through the center of the lens will in effect continue in the same direction that it had when it entered the lens.
Image Formation by Converging Lens
Diverging Lens
Rules For Diverging Lenses 1) Any incident ray traveling parallel to the principal axis of a diverging lens will refract through the lens and travel in line with the focal point (i. e. , in a direction such that its extension will pass through the focal point). 2) Any incident ray traveling towards the focal point on the way to the lens will refract through the lens and travel parallel to the principal axis. 3) An incident ray which passes through the center of the lens will in effect continue in the same direction that it had when it entered the lens.
Diverging Lens Image Formation Always Virtual, Smaller, and Right-Side Up
The Human Eye
The Human Eye
Normal Eye Focus
Near-Sighted (Myopia)
Far-Sighted (Hypermetropia)
Astigmatism • Cornea is oval shaped instead of spherical. This causes light to focus on two or more spots.
LASIK Laser-assisted In Situ Keratomileusis
- Refraction by a lens
- Refraction of light in lenses
- What kind of shape
- How does light change direction
- Lines that bend and change direction gradually
- The ability to produce maximum force in the shortest time
- Lines that change direction gradually
- Thế nào là hệ số cao nhất
- ưu thế lai là gì
- Hệ hô hấp
- Các môn thể thao bắt đầu bằng tiếng chạy
- Tư thế ngồi viết
- Hát kết hợp bộ gõ cơ thể
- Bàn tay mà dây bẩn
- Cách giải mật thư tọa độ
- Tư thế ngồi viết
- Voi kéo gỗ như thế nào
- Thẻ vin
- Thể thơ truyền thống
- Các châu lục và đại dương trên thế giới
- Hổ sinh sản vào mùa nào
- Từ ngữ thể hiện lòng nhân hậu
- Diễn thế sinh thái là
- Slidetodoc