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:
Answer & explanation
Correct answer: option 2
$\frac{1}{F} = (\mu - 1) ( \frac{1}{R_1} - \frac{1}{R_2})$
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 }$