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Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cmfrom the optical centre?

Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cmfrom the optical centre? Correct Answer 11.25 diopters

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Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12cm from the optical centre?
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Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cm from the optical centre?
Consider the following statement: A ray of light passing through the optical centre of a convex lens emerges without any deviation after refraction. A ray of light passing through the first principal focus of a convex lens  emerges parallel to the principal axis after refraction. A ray of light passing through the optical centre of a convex lens emerges parallel to the principal axis after refraction. Which one of the following statements INCORRECT?
Consider the following statement 1. When the object is placed at infinity of the convex mirror, then the image is formed at the focus. 2. The image formed by a convex mirror is always real, inverted, and smaller in size. 3. When the object is placed at infinity and pole of the convex mirror, then the image is formed at the focus. Which of the following statements is CORRECT?