Physics-
Spherical aberration in spherical mirrors is a defect which is due to dependence of focal length ‘f’ on angle of incidence ‘ q ’ as shown in figure is given by
where R is radius of curvature of mirror and q is the angle of incidence The rays which are closed to principal axis are called paraxial rays and the rays far away from principal axis are called marginal rays As a result of above dependence different rays are brought to focus at different points and the image of a point object is on a point Which of the following statements are correct regarding spherical aberration :

Physics-General
- It can be completely eliminated
- If can’t be completely eliminated but it can’t be minimised by allowing either paraxial or marginal rays to hit the mirror
- It is reduced by taking large aperture mirrors
- none of the above
Answer:The correct answer is: If can’t be completely eliminated but it can’t be minimised by allowing either paraxial or marginal rays to hit the mirror
Book A Free Demo

Grade*
Select Grade