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Activity 9.7 — Power of a Lens
NCERT Activity 9.7: Explore the power of a lens — how thickness relates to focal length, and how to calculate power using P = 1/f in dioptres.
How To Perform
1
Lens Thickness
Compare lenses of different thicknesses and their focal lengths.
2
Converging Light
See how different lenses converge or diverge light rays.
3
Calculate Power
Learn the formula P = 1/f and calculate power in dioptres.
4
Power Signs
Understand why convex lenses have +ve power and concave have −ve.
5
Classify
Calculate the power of a convex lens with f = 50 cm.