Title Chp_11_The Human Eye and The Colourful World (Lec-5).pptx ✅

TYNDAL L The phenomenon of scattering of light by colloidal particles. Source of Light Convex Lens Colloidal Solution Cardboard with hole Convex Lens Screen Sodium thiosulphid e Sulphuri c acid Conclusion : Violet, indigo blue get scattered most hence solution turns bluish. Orange and red are scattered least hence reddish orange spot is observed on the screen.
NUMERICA LS
A concave lens of focal length 80 cm is required and the power of the lens is 1.25 Diopters The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the defect ? Given : u = ∞ v = Nature and Power ? To find : = – Formulae : Solution : = – ∴ = – ∴ = ∴ f = P = = = v = 80cm 80 cm – 80 cm – f = ? f = 80cm P = 1.25 P = u = ∞