convex lens have a focal length of 20 cm . find the position of object for which the image will the half the size of object .
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1/f = 1/v + 1/b, where f - focal length, v - object distance, b - image distance
To get an image that’s two times smaller than an object, image distance should be two times smaller than object distance, which gives us:
b = v/2
1/20 = 1/v + 2/v
20 = v/3
60 = v
Answered by
1
Answer:
Given thin lens equation:
1/f = 1/v + 1/b, where f - focal length, v - object distance, b - image distance
To get an image that’s two times smaller than an object, image distance should be two times smaller than object distance, which gives us:
b = v/2
1/20 = 1/v + 2/v
20 = v/3
60 = v
Step-by-step explanation:
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