A spherical surface of radius 30cm separates two transparent media A and B with refractive indices 1.33 and 1.48 respectively. The medium A is on the convex side of the surface. Where should a point object be placed in medium A so that the paraxial rays become parallel after refraction at the surface ?

A spherical surface of radius 30cm separates two transparent media A a

1.	A spherical surface of radius 30cm separates two transparent media A and B with refractive indices 1.33 and 1.48 respectively. The medium A is on the convex side of the surface. Where should a point object be placed in medium A so that the paraxial rays become parallel after refraction at the surface ?
Answer» -AXIAL rays BECOME parallel after refraction ... so IMAGE is formed at infinityv=∞μ1=1.33u=?μ2=1.48R= 30cmFrom the formula:μ2/v - μ1/ u= μ2-μ1/R=1.48 /∞ - 1.33/u = 1.48-1.33/30- 1.33/u- 0.15/30u= - 266.0cmObject should be PLACED at a DISTANCE of 266cm from surface on side A

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