Question

The image of an object formed by a convex lens may be
realinverted erect/inverted smaller/larger than the object, it would depend upon the distance of the object from the lens. However, the image of an object formed by a concave lens is always virtual, erect and smaller in size than the object

(1). To obtain image of an object on a screen, we require a

(a) convex lens (b).concave lens (c).concave lens of large focal length (d),concave lens of small focal length

(II) Where should an object be placed in front of a concave lens to obtain a virtual image of the object?

(a).infinity. (b). Principal focus. (c)very close to the lens (d) any distance from the lens

(III). Where should an object be placed in front of a convex lens to obtain image ofthe size of the object?

(a) at focus F(b) At 2F (c) beyond 2F (d) None of these

(IV). To obtain an image smaller than the size of the object, we may used a

(a) convex lens only (b) concave only (c)either a convex lens or a concave lens (d) cannot say


(V). Name the part of a lens through which a ray of light passes without suffering any deviation,

(a).optical center (b).At F (c) At 2F (d) none of the above
​

Answer 1

man

Explanation:

are you landing page

Answer 2

Answer:

The answers are given below

Explanation:

1. (a) convex lens
2. (c) very close to the lens. The object must be placed inside the focal point (between the pole and the focal point) in front of the lens to obtain a virtual upright magnified image.
3. (b) At 2F. At twice the focal length, the image produced by the converging lens is real and the same size as the object. If the focal length of the lens is 20cm, the object should be placed 40cm in front of the lens, creating an inverted image of the same size as the object 40cm behind the lens.
4. (b) concave only
5. (a) the optical center can be defined as the point on the axis through which the ray passes without deflection, or it can be defined as the center of the lens through which the ray passes without deflection.

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