(a)List four characteristics of the image formed by a concave lens off

1.	(a)List four characteristics of the image formed by a concave lens offocal length 20 cm when the object is placed at a distance of 40 emfrom its optical centre.The size of image of an object by a convex lens of focal length 20 cmis observed to be reduced to - rd of its size. Find the distance of the(b)object from the optical centre of the lens.1/3/3]
Answer» Explanation: When the object is kept at a DISTANCE of 10 cm from the lens, the distance is greater than the FOCAL length. HENCE, the image would be real and INVERTED and would be formed on the . other SIDE of the lens. The distance of the image can be calculated from the lens formula 1v−1u=1f.

(a)List four characteristics of the image formed by a concave lens offocal length 20 cm when the object is placed at a distance of 40 emfrom its optical centre.The size of image of an object by a convex lens of focal length 20 cmis observed to be reduced to - rd of its size. Find the distance of the(b)object from the optical centre of the lens.1/3/3]

Answer»

Explanation:

When the object is kept at a DISTANCE of 10 cm from the lens, the distance is greater than the FOCAL length. HENCE, the image would be real and INVERTED and would be formed on the . other SIDE of the lens. The distance of the image can be calculated from the lens formula 1v−1u=1f.

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