Question

a convex lens has a focal length of 30cm the an object is placed in the front of it at a distance of 90 cm find the distance of the image from the lens what type of images formed
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Answer 1

Answer:

22.5cm

Explanation:

here ,

u=-90 cm

f=+30cm

1/v +1/u =1/f

now apply sign convention......just as u do in cartisian system(graphs)......I have already used it...