Question

Write and draw image formation of concave and convex lens

Answer 1

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Image Formation by Concave and Convex Lenses:

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.

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