AP EAMCET202422 May 2024Morning ShiftPhysicsRay OpticsActual
A person can see objects clearly when they lie between 40 cm and 400 cm from his eye. In order to increase the maximum distance of distant vision to infinity, the type of lens and power of correction lens required respectively are
Options
- AConvex, 0.25 Dioptre
- BConcave, -0.25 Dioptre
- CConcave, -0.5 Dioptre
- DConvex, 0.5 Dioptre
Correct answer
B. Concave, -0.25 Dioptre
Step-by-step solution
u =- , v =-400 ~cm By lens formula, aligned & 1 f = 1 v - 1 u = 1 -400 - 1 - & f=-400 ~cm aligned Power of lens is given by P= 100 f( in cm ) = 100 -400 =-0.25 D Concave lens, -0.25 D