Physics
State the changes in the position, size and nature of the image when the object is brought from infinity up to the concave lens. Illustrate your answer by drawing ray diagrams.
Refraction Lens
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Answer
(i) When the object is at infinity, the image is formed at the second focus F2, on the side of the object. It is virtual and erect. It is highly diminished in size.
(ii) When the object is at finite distance from the concave lens, the image is formed between the focus and optical centre, on the same side of lens as the object. It is virtual and erect. It is diminished in size.
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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.
The correct lens formula is :
- f =
- f =
Identify the wrong statement.
- For a convex lens, u is always negative.
- For a convex lens, f is always positive.
- For a convex lens, v is positive for a virtual image and negative for a real image.
- For a concave lens, u, v and f all are negative.