Question

Guys can u explain why she has converted focal length to positive ?
pls help .... grade 10 physics​

Answer 1

Answer:

Now the convex lens converges the incident rays. Hence the rays converge to a single point infront of the lens. So the image distance is positive here. you can easily verify that the focal length is in the positive x direction for a convex lens while it is along the negative x direction for a concave lens.

Explanation:

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