Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Ray Optics

Question:

Match List I with List II

List I List II
A. Double Convex Lens       I. $f=\frac{R}{\left(1-n_g^a\right)}$
B. Plane Convex Lens II. $f=\frac{R}{2\left(n_g^a-1\right)}$    
C. Double Concave Lens    III. $f=\frac{R}{\left(n_g^a-1\right)}$
D. Plano Concave Lens IV. $f=\frac{R}{2\left(1-n_g^a\right)}$    

Choose the correct answer from the options given below:

Options:

A-II, B-I, C-IV, D-III

A-II, B-III, C-IV, D-I

A-II, B-III, C-I, D-IV

A-IV, B-III, C-II, D-I

Correct Answer:

A-II, B-III, C-IV, D-I

Explanation:

$\frac{1}{F} = (\mu - 1) ( \frac{1}{R_1} - \frac{1}{R_2})$

For double convex lens $ R_1 = R , R_2 = -R , F = \frac{R}{2(\mu - 1)}$

Plane Convex lens $ R_1 = R , R_2 = \infty , F = \frac{R}{\mu - 1}$

Double concave lens $ R_1 = -R , R_2 = R , F = \frac{R}{2(1 - \mu )}$

Plano concave lens $ R_1 = \infty , R_2 = R , F = \frac{R}{1 - \mu }$