Question

Note: The lens/mirror formula is : 1/f= 1/s + 1/s’

Analysis Questions:

1. Plot a graph of 1/s (x-axis) vs. 1/s’ (y-axis).

2. Rearrange the lens equation as 1/s’= -1/s + 1/f and compare with y=mx+c. Record the slope and intercept. From the intercept, find f.

3.. How did the focal length obtained from the intercept compare with that obtained from the distant object?

Slope of graph ……………………   Focal length from intercept ………………

Intercept of graph ………………. Focal length from distant object ………………  

Table 2: Converging (Convex) Lens
Object distance, s (cm)	Image distance, s’ (cm)	1/s (cm)-1	1/s’ (cm)-1
12	45	0.08	0.02
15	31	0.07	0.03
20	20	0.05	0.05
25	17	0.04	0.06
30	15	0.03	0.07

Answer 1

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