Q. 6

A ray of light in

Answer :

Here, we have a case of minimum deviation.

We know, the prism angle,


Refractive index,


Let the angle of incidence be and that of refraction be


Therefore,






OR


Given, Refractive index of lens,


Refractive index of medium,


Focal length of lens,


Let the focal length in the medium be . Let the two radii of curvature be and .


We know





Now, the focal length in medium would be





For lens to act as a plane sheet of glass, the refractive index of the medium should be same as that of the lens, that is 1.5.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

(i) Derive the maPhysics - Board Papers

A symmetric biconPhysics - Board Papers

Mrs. Rashmi SinghPhysics - Board Papers

(a) Describe any Physics - Board Papers

Three immiscible Physics - Exemplar

Obtain an expressPhysics - Exemplar

An equi-convex lePhysics - Exemplar