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Home » State the changes in the position, size and nature of the image when the object is brought from infinity up to the convex lens. Illustrate your answer by drawing the ray diagrams.
State the changes in the position, size and nature of the image when the object is brought from infinity up to the convex lens. Illustrate your answer by drawing the ray diagrams.
Class 10 | ICSE | Physics | Refraction through a Lens | Selina
State the changes in the position, size and nature of the image when the object is brought from infinity up to the convex lens. Illustrate your answer by drawing the ray diagrams.

Solution:

(i) When the object is situated at infinity, the position of the image is at F2. It is real, inverted and very much diminished in size.

(ii) When the object (AB) is situated beyond 2F1, the position of image (A’B’) is between F2 and 2F2. It is real, inverted and diminished in size.

(iii) When the object (AB) is situated at 2F1, the position of the image (A’B’) is at 2F2. It is real, inverted and of the same size as the object.

(iv) When the object (AB) is situated between 2F1 and F1, the position of image (A’B’) is beyond 2F2. It is real, inverted and magnified in size.

(v) When the object (AB) is situated at F1, the position of the image is at infinity. It is real, inverted and very much magnified in size.

(vi) When the object (AB) is situated between lens and F1, the position of (CD) is on the same side. It is magnified in size and virtual and upright.

i

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