Unit 10 · Effects of injuries to the cornea in the eyes
Power of a lens
ScienceSubject
8 minEstimated read
Converging and diverging capacity of spectacle lenses
Method
Take a ray box with three slits, and three concave and three convex lenses having different thicknesses.
Allow the light rays from the ray box to fall on the lenses of your friend's or relative's spectacles and observe their converging and diverging capacities.
Ask the owner of each pair of spectacles whether the power of the lens is -4 dioptre (D), +2 dioptre (D), and so on. Lenses with positive power are convex lenses and lenses with negative power are concave lenses.
Compare the degree of refraction and the thickness of two or more lenses, and record your observations in the table.
Order of thickness of the lens
Diverging capacity
Power of the lens used in spectacles
Thickest lens
Having the highest diverging capacity
+4D
Discussion
Conclusions: what does your table show about the thickness of a lens and how strongly it bends light?
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