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Which of the following statements are always true? (i) When the object is placed nearer to the focal point of a converging lens the image gets bigger. (ii) When the object is placed farther away from the converging lens, the image gets smaller. (iii) When the object is placed very far away from the converging lens, the image distance approaches focal length.

Which of the following statements are always true? (i) When the object is placed nearer to the focal point of a converging lens the image gets bigger. (ii) When the object is placed farther away from the converging lens, the image gets smaller. (iii) When the object is placed very far away from the converging lens, the image distance approaches focal length. Correct Answer (i), (ii) and (iii)

CONCEPT:

  • Lens: The transparent curved surface which is used to refract the light and make an image of any object placed in front of it is called a lens.
    • Convex lens: ​A lens having two spherical surfaces, bulging outwards is called a double convex lens (or simply convex lens).
    • It is thicker in the middle as compared to the edges.
    • Convex lenses converge light rays and hence, convex lenses are also called converging lenses.

EXPLANATION:

  • The image formed by the convex lens are:

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  • When the object is placed nearer to the focal point i.e., in between the focus and centre of curvature or in between the focus and the pole of the converging lens, then the mage gets bigger. Therefore statement  1 is correct.
  •  When the object is placed farther away from the converging lens i.e., beyond the centre of curvature, the image gets smaller. Therefore statement 2 is correct.
  • When the object is placed very far away from the converging lens i.e., at infinity, the image is formed at focus and thus the image distance approaches focal length. Therefore statement 3 is correct.

Related Questions

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2. The focal length of the eyepiece is smaller than the focal length of the objective.
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4. The image produced in a normal optical microscope is virtual.
Select the correct answer:
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