Question

(a) For which position of an object, a real, diminished image is formed by a convex lens?
(b) Two convex lenses A and B have focal lengths of 2.5 cm and 12.0 cm, respectively. Which lens has a greater power?
​(c) Describe with the help of a labelled ray-diagram, the formation of image when an object is placed in the front of a convex lens between focus and optical centre. State any two characteristics of the image formed.

Answer 1

Explanation:

(a) If an object exceeds the "2f" convex lens, the resulting image will be real and diminished in nature

(b) The lens power is indirectly proportional to the focal length.

For Example $P\alpha \frac{1}{f}$    (in meter)

Given these conditions, smaller focal length lenses would have greater power. Therefore, the A lens  have greater power.

(c)The formation of image when an object is placed in the front of a convex lens between focus and optical centre is explained clearly in the attachment

Characteristics of the image formed is as follows

• The virtual image
• The image is vertical
• The image is enlarged

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