CBSE 2022-2023.
Important MCQ.
Class 10 Physics Question.
Important Questions of Ch: 10 Class10th NCERT.
Important MCQ of Science Class 10th.
NCERT SCIENCE.
CBSE Board state and other board.
NCERT book extra.
An object is placed at a distance of 40cm from a convex lens and its real and inverted image of same size is formed on a screen placed on other side of lens. The focal length of lens is
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