Question

How are the images when an object is moved from infinity to lens ?

Answer 1

Answer:

Explanation:

The focal length to define the distance between the principle focus and the center of the lens. According to the question. When the object is moved from infinity to the convex lens then the image will be formed at principal focus. Hence,The image is formed highly diminished, real and inverted

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Answer 2

Here are the conditions in a convex lens to form an image:-

• When object is at infinity- Image formed at focus. Real ,inverted and extremely small.

• When object is near to centre of curvature- Image formed between focus and centre of curvature. Real, inverted and small in size than object size.

• When object is on centre of curvature- Image formed at centre of curvature. Real, inverted and same size as object size.

• When object is between centre of curvature and focus-Image formed beyond centre of curvature. Real inverted and larger in size.

• When object is on focus- Image formed at infinity. Real, inverted and extremely large.

• When object is between focus and optical centre- Image formed is virtual and can be seen in the lens only. Erect and magnified.

Related important points:-

• As object moves towards focus, image moves away from focus.

• As object moves towards focus, image grows in size but remains inverted.

• As object moves between focus and optical centre, image decreases in size virtually as distance from the lens decreases.