The object is located at a distance d = 15 cm from the collecting lens, the optical power
| December 19, 2020 | education
The object is located at a distance d = 15 cm from the collecting lens, the optical power of which is D = 10 diopters. How far (f) is the image from the lens?
Given:
D = 10 diopters
d = 15 cm = 0.15 m
Find: f =?
Decision:
1 / F = 1 / f + 1 / d
1 / F = D
D = 1 / f + 1 / d
1 / f = D-1 / d
1 / f = 10-1 / 0.15 = 3, (3)
f = 1 ÷ (1 / f) = 1 ÷ 3, (3) = 0.3 m
Answer: f = 0.3m
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