Question

rules of image formation by concave and convex lens​

Answer 1

Answer:

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Explanation:

Convex Lenses

When an object is placed at infinity, the real image is formed at the focus. The size of the image is much smaller as compared to that of the object.

When an object is placed behind the center of curvature, the real image is formed between the center of curvature and focus. The size of the image is same as compared to that of the object.

When an object is at the center of curvature, the real image is formed at the other center of curvature. The size of the image is same as compared to that of the object.

When an object is placed in between the center of curvature and focus, the real image is the formed behind the center of curvature. The size of the image is smaller as compared to that of the object.

When an object is placed at the focus, a real image is formed at infinity. The size of the image is much larger as compared to that of the object.

When an object is placed in between focus and pole, a virtual image is formed. The size of the image is larger as compared to that of the object.

Concave Lenses

When an object is placed at infinity, a virtual image is formed at the focus. The size of the image is much smaller as compared to that of the object.

When an object is placed at a finite distance from the lens, a virtual image is formed between pole and focus of the convex lens. The size of the image is smaller as compared to that of the object.

Answer 2

Answer:

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Rules of concave lens

1. Rule 1: A ray of light parallel to the principal axis of the concave lens appears to be coming from focus after refraction through the lens.
3. Rule 2: A ray of light passing through the optical centre of the concave lens goes straight after refraction through the lens.
4. Rule 3: A ray of light going towards the focus on another side of the concave lens becomes parallel to the principal axis after refraction through the lens.

Rules of convex lens

1. Rule 1: A ray of light which is originally parallel to the principal axis passes through the focus after refraction through the lens.
2. Rule 2: A ray of light passing through the optical centre of the convex lens does not bent after refraction but goes straight. Also, a ray of light going along the path of principal axis of a convex lens also goes straight and does not deviate.
3. Rule 3: When a ray of light passes through the focus of the convex lens then it becomes parallel to the principal axis after refraction through the lens.

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