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3 years ago

1. An object 20 cm away from a lens produces a focused image on a film 15 cm away, what is the focal length

Physics

1 answer:

morpeh [17]3 years ago

6 0

8.6 cm

Explanation:

Step 1:

In this we have to find the focal length of converging lens.

To find focal length we have,

$(1/u) + (1/v) = (1/f)$

where u = Object distance

v= Image distance

f = Focal length

Step 2:

$(1/f) = (1/20) + (1/15)$

(1/f) = 0.116

f = 1/0.116

f = 8.6 cm

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