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A sharp image of a distant object is obt...

A sharp image of a distant object is obtained on a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the :

A

lens and the object

B

lens and the screen

C

object and the screen

D

lens and the screen and also object and the screen

Text Solution

Verified by Experts

The correct Answer is:
b
Focal length of the lens distance between the lens and the screen.
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Material : Convex lens , screen, meter scale, stand for the lens etc. Method : Keeping the screen fixed, obtain a clear image of a distant object like a tree or a building with the help of the lens on the screen . Measure the distance between the screen adn the lens with the hlep of the metre scale. Now turn the other side of the lens towards the screen. Again obtain a clear image of the distant object on the screen by moving the lens forward or backward. Measure the distance between the screen and the lens again. The image of a distant object is obtained close to the focus of the lens, hence , the above distance is the focal length of the lens. Discuss the relation between this distance and the radius of curvature of the lens with your teacher .

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Knowledge Check

  • A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens

    A
    away from the screen
    B
    towards the screen
    C
    to a position very far away from the screen
    D
    either towards or away from the screen depending upon the position of the object.

  • While determining the focal length of a concave mirror, a student obtained the image of a distant object on a screen. In order to get the focal length of the mirror, the student should measure the distance :

    A
    between the object and the mirror only
    B
    between the screen and the mirror only
    C
    between the object and the screen only
    D
    between the screen and mirror as well as between the screen and the object

  • A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens.

    A
    away from the screen
    B
    towards the screen
    C
    to a position very far away from the screen
    D
    either towards or away from the screen depending upon the position of the object.

    • Similar Questions

    Explore conceptually related problems

    It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens? If you keep on decreasing the distance between the object and the lens, will you still able to obtain the image on the screen? Explain

    Try this Material: Convex lens, screen, metre scale, stand for the lens etc. Method: Keeping the screen fixed, obtain a clear image of a distant object like a tree or a building with the help of the lens on the screen. Measure the distance between the screen and the lens with the help of the metre scale. Now tum the other side of the lens towards the screen. Again obtain a clear image of the distant object on the screen by moving the lens forward or backward. Measure the distance between the screen and the lens again. What will happen if you use a concave lens in this experiment?

    A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens:

    if you focus the image of a distant object, whose shape is given below, on a screen using a convex lens, the shape of the image of this object on the screen would be :

    The steps followed in determining the focal length of a given convex lens by obtaining a sharp image of a distant object are listed below but they are not in correct order. (A) Measure the distance between the lens and screen. (B) Adjust the position of the lens to form a sharp image. (C) Select a suitable distant object. (D) Hold the lens between the object and the screen with its faces parallel to the screen What should be the correct sequence of steps?

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