5. Refraction Through a Lens
The chapter delves into the properties and functions of convex and concave lenses, explaining how they refract light and form images. It highlights important terms associated with lenses, the concept of magnification, and the lens formula. Practical applications of these lenses in devices such as cameras and spectacles are also discussed.
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Sections
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What we have learnt
- A lens can either be convex (converging) or concave (diverging) with specific properties of refraction.
- Important terms associated with lenses include principal axis, optical center, focal length, and magnification.
- Different positions of objects relative to lenses yield various image characteristics such as size, nature, and position.
Key Concepts
- -- Convex Lens
- A lens thicker in the middle than at the edges, which converges parallel light rays to a point.
- -- Concave Lens
- A lens thinner in the middle than at the edges, which diverges parallel light rays.
- -- Focal Length
- The distance from the optical center of the lens to the principal focus.
- -- Magnification
- The ratio of the height of the image to the height of the object, indicating enlargement or reduction.
- -- Lens Formula
- An equation relating object distance (u), image distance (v), and focal length (f): 1/f = 1/v - 1/u.
Additional Learning Materials
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