How would a pencil look like if you saw it through (a) a concave lens, and (b) a convex lens? (Assume the pencil is close to the lens). Is the image real or virtual?

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Solution

(a) When a pencil is seen through a concave lens placed close to it, it appears smaller than it's actual size. Because a concave lens always produces a virtual image, the image formed is virtual.

(b) When a pencil is seen through a convex lens placed close to it, the image so formed appears larger than it's actual size. The reason for this is, the pencil is placed within the focus of the lens and therefore, the image formed is virtual.

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Q. How would a pencil look like if you see it through a convex lens? (Assume that the pencil is close to the lens). Is the image real or virtual ?

Q. How would a pencil look like if we see it through a concave lens ?

Question 4

You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an enlarged image of an object you can use either

(a) concave mirror or convex mirror.

(b) concave mirror or convex lens.

(d) concave lens or convex lens.

Which of the following statements are true :

1) A convex lens always gives a real image.
2) A concave lens always gives virtual image.
3) A convex lens can also gives magnified virtual image.

Q. Concave lens always produces virtual image and convex lens always produces real image.

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