Saved Bookmarks
| 1. |
Light from a point source in air falls on a spherical glass surface (n = 1.5 and radius of curvature = 20 cm). The distance of the light source from the glass surface is 100 cm. At what position the image is formed? |
|
Answer» SOLUTION :RADIUS of curvature of curved surface R =20 cm Refractive index of medium `n_2 =1.5, ` Refractive index of air `n_1 = 1.0` Object distance U = - 100 cm Equation of refraction by curved surface `(n_2)/(v) - (n_1)/(u) = (n_2 -n_1)/(R)` `(1.5)/(v) - (1)/(-100) = (1.5 - 1.0)/(20)` `therefore (1.5)/(v) = -(1)/(100) + (0.5)/(20)` `therefore(1.5)/(v) = (1.5)/(100)` `therefore v= (1.5 xx 100)/(1.5)` `thereforev = 100 cm` Thus, image will be obtained at 100 cm distance from surface in direction of INCIDENT ray. |
|