Lesson Notes By Weeks and Term v4 - SHS 3
WAVE
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WAVE
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Subject: Physics
Class: SHS 3
Term: 1st Term
Week: 19
Grade code: 3.2.2.LI.3
Strand code: 2
Sub-strand code: 2
Content standard code: 3.2.2.CS.1
Indicator code: 3.2.2.LI.3
Theme: ENERGY
Subtheme: WAVE
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This lesson focuses on the mathematical relationship that governs how lenses form images. Lenses are not just abstract concepts in a physics textbook; they are everywhere in our daily Ghanaian lives. From the glasses ('spectacles') that help our grandparents read the Bible or the Daily Graphic, to the camera lens on our phones used to capture memories at a festival, and the projectors used in our churches and schools. By understanding the lens formula, we gain the power to predict where an image will be formed, how large it will be, and what its characteristics are.
This section breaks down all the essential knowledge needed to master the lens formula. A. The Thin Lens Equation (Lens Formula)
The thin lens equation is a formula that relates three key quantities for any lens: Object distance (u): The distance from the optical centre of the lens to the object. Image distance (v): The distance from the optical centre of the lens to the image. Focal length (f): The distance from the optical centre to the principal focus of the lens.
The formula is:
``` 1/f = 1/u + 1/v ```