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Engineering

2 months, 2 weeks ago

Two lenses of power –15 D and +5 D are in

contact with each other. The focal length of the

combination is

- Option 1)
+10cm

- Option 2)
-20cm

- Option 3)
-10cm

- Option 4)
+20cm

Views

Option 1)

+10cm

Option 2)

-20cm

**Option 3)**

**-10cm**

Option 4)

+20cm

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