Question

When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.
(a) What is the focal length of lens A?
(b) What is the focal length of lens B?
(c) What is the nature of lens A?
(d) What is the nature of lens B?

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Answer 1

question a -What is the focal length of lens A?

answer a - The object is placed at focus, so f = 10 cm.

question b-What is the focal length of lens B?

Answer b - The object is placed at a distance twice the focal length, so f = 5 cm.

question c-What is the nature of lens A?

Answer c- Convex lens (since image is real).

question d-What is the nature of lens B?

Answer d- Convex lens (since image is real).

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Answer 2

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(a) The object is placed at focus, so f = 10 cm.

(b) The object is placed at a distance twice the focal length, so f = 5 cm.

(c) Convex lens (since image is real).

(d) Convex lens (since image is real).

❍ Focal length of lens:-

• The focal length is the distance between the center of a convex lens and the focal point of the lens.

❍ Convex lens or mirror:-

• Convex lens/mirror's outer surface is polished and inner surface is reflecting. These type of lens or mirrors are called convex mirrors or lens. They are also called converging mirror.

❍ Concave lens or mirror:-

• Concave lens/mirror's outer surface is reflecting and inner surface is polished. These type of lens or mirrors are called concave mirrors or lens. They are also called diverging mirror.

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