Q4 To form an image twice the size of an object using a convex lens of focal length 20 cm, the distance of an object must be * 20 cm between 20 cm and 40 cm cannot say

Q4 To form an image twice the size of an object using a convex lens of

1.	Q4 To form an image twice the size of an object using a convex lens of focal length 20 cm, the distance of an object must be * < 20 cm > 20 cm between 20 cm and 40 cm cannot say
Answer» Explanation:When the image FORMED by a convex lens, INVERTED and same size as the object, then the distance of the object from the lens is 2F (twice the focal length). Here, Focal length, f=20 cm So, 2f=2×20 cm =40 cm Thus, the object should be placed at a distance of 40 cm in front of the convex lens

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Q4 To form an image twice the size of an object using a convex lens of focal length 20 cm, the distance of an object must be * < 20 cm > 20 cm between 20 cm and 40 cm cannot say

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