Draw a ray diagram to show the path of the refracted ray in each of the following cases:; A ray of light incident on a concave lens is; (i) passing through its optical center.; (ii) parallel to its principal axis.; (iii) directed towards its principal axis(All India - 2014)
Answers
Ray diagrams for the different cases are given below
Explanation:
Refraction
It is bending of light rays when it passes from one medium to another .
Cause of refraction
Difference in the densities of medium due to which speed of light differ .
Let us see the rules to obtain image from concave lens
1st case : A ray of light incident on a concave lens passing through optical center .
When it passes through optical center , it goes straight .
2nd case : A ray of light incident on a concave lens parallel to its principal axis.
A ray of light incident on a concave lens parallel to its principal axis diverges after refraction but appear to pass through focus .
3rd case : A ray of light incident on a concave lens directed towards its principal axis
A ray of light incident on a concave lens directed towards its principal axis diverges but appear to pass through focus .
