Question

When performing this experiment. EXPERIMENT 15: DETERMINATION OF FOCAL LENGTH (f) OF THE CONVEX LENS BY DISPLACEMENT METHOD APPARATUS: Ray box, convex lens, screen, optical bench, meter rule, 2 lens polder. Object or (Ray box) Fig. 3 First find the rough focal length of the convex lens by focusing any distance object. Then keep the source of light (object) and the screen at a distance equal to or greater than four times the rough focal length of the lens as (D) as shown in figure 3 above. Find two positions of the lens \( A \) and \( B \) respectively at which clear images are formed on the screen in each case. Determined=(B-A); repeat the experiment for four other values of (D) by increasing (D) in steps of 5. Knowing that: \( f=\left(D^{2}-d^{2}\right) / 4 D \)

          When performing this experiment.
EXPERIMENT 15:
DETERMINATION OF FOCAL LENGTH (f) OF THE CONVEX LENS BY DISPLACEMENT METHOD
APPARATUS: Ray box, convex lens, screen, optical bench, meter rule, 2 lens polder.

Object or (Ray box)
Fig. 3
First find the rough focal length of the convex lens by focusing any distance object. Then keep the source of light (object) and the screen at a distance equal to or greater than four times the rough focal length of the lens as (D) as shown in figure 3 above.
Find two positions of the lens \( A \) and \( B \) respectively at which clear images are formed on the screen in each case. Determined=(B-A); repeat the experiment for four other values of (D) by increasing (D) in steps of 5.

Knowing that: \( f=\left(D^{2}-d^{2}\right) / 4 D \)

When performing this experiment.
EXPERIMENT 15:
DETERMINATION OF FOCAL LENGTH (f) OF THE CONVEX LENS BY DISPLACEMENT METHOD
APPARATUS: Ray box, convex lens, screen, optical bench, meter rule, 2 lens polder.

Object or (Ray box)
Fig. 3
First find the rough focal length of the convex lens by focusing any distance object. Then keep the source of light (object) and the screen at a distance equal to or greater than four times the rough focal length of the lens as (D) as shown in figure 3 above.
Find two positions of the lens A and B respectively at which clear images are formed on the screen in each case. Determined=(B-A); repeat the experiment for four other values of (D) by increasing (D) in steps of 5.

Knowing that: f=(D^2-d^2) / 4 D

Added by Margaret P.

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