HC Verma - Concepts of Physics Part 1

Book: HC Verma - Concepts of Physics Part 1

Chapter: 18. Geometrical Optics

Subject: Physics - Class 11th

Q. No. 38 of Exercises

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38

A spherical surface of radius 30 cm 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?

38.PNG


Spherical surface of Radius r= 30cm


Refractive indexes of two mediums are:


Medium A=


Medium B =


The medium A is on the convex side of the surface.


We know that;


Paraxial rays become parallel after refraction and the image is formed at infinity.


Therefore, image distance = v=


By using lens equation;







The object is placed at the distance of 266.0 cm from the convex surface on side A.


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