JEE Main 2019 Physics question
An object is at a distance of 20 m from a convex lens of focal length 0.3 m. The lens forms an image of the object. If the object moves away from the lens at a speed of 5 m/s, the speed and direction of the image will be:
Answer: (A)
Solution
v_{img}\dfrac{f}{u - f}$|| =
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