Distinguish between convex lens and concave lens.

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Solution

Convex lens Concave lens

1. Objects appear to be big in the lens. 1. Objects appear to be shrink in the lens.

2. It generally forms real image, (except object is placed between optical centre and focal point) 2. It always forms virtual image.

3. Light rays tend to converge after refraction from lens. 3. Light rays tend to diverge from lens after refraction.

4. The image due to lens may be enlarged or same size or diminished. 4. The image is always diminished.

5. The image due to lens may be inverted or erect. 5. The image is always erect.

6. It is used to correct hypermetropia. 6. It is used to correct myopia.

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Question 7

You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from

(a) both concave lens and convex lens.

(b) both concave mirror and convex mirror.

(d) Both convex mirror and concave lens.

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Convex lens	Concave lens
1. Objects appear to be big in the lens.	1. Objects appear to be shrink in the lens.
2. It generally forms real image, (except object is placed between optical centre and focal point)	2. It always forms virtual image.
3. Light rays tend to converge after refraction from lens.	3. Light rays tend to diverge from lens after refraction.
4. The image due to lens may be enlarged or same size or diminished.	4. The image is always diminished.
5. The image due to lens may be inverted or erect.	5. The image is always erect.
6. It is used to correct hypermetropia.	6. It is used to correct myopia.