Math, asked by rithu4621, 1 year ago

An object 50cm tall is placed on the principal axis of a convex lens it's 20cm tall image is formed on the screen placed at a distance of 10 cm from the lens . calculate the focal length of the lens Why is h' taken to be -20 in the answer?

Answers

Answered by sofiaroy

1

because h is inthe -ve side

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