What is the main cause of weathering on a beach?
the movement of the waves
the sunshine heating the sand
the pet dogs running on the sand
the people walking on the beach
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Ответ:
f = 17.14 cm
Explanation:
Given that,
The object distance, u = -40 cm
The image distance, v = +30 cm
We need to find the focal length of the lens. The lens formula is given by :
So, the focal length of the lens is 17.14 cm.