Find the odd one out and give its explanation. Object distance, Image distance, Focal length, Principal axis - Science and Technology 1

Advertisements
Advertisements
MCQ

Find the odd one out and give its explanation.

Options

  • Object distance

  • Image distance

  • Focal length

  • Principal axis

Advertisements

Solution

Principal axis

Explanation-

Except for principal axis, all other quantities can be measured physically with scale, thread, etc.

Concept: Lens
  Is there an error in this question or solution?
Chapter 7: Lenses - Find odd one out.

RELATED QUESTIONS

The power of a lens is - 5D.

1) Find its focal length.

2) Name the type of lens.


Draw a ray diagram to show how a converging lens can form a real and enlarged image of an object.


State whether the following statement are ‘true’ or ‘false’ by writing T/F against them.

A convex lens has a divergent action and a concave lens has a convergent action.


The following  diagram shows the experimental set up for the determination of focal length of a lens using a plane mirror.


(i) draw two rays from the point O of the object to show the formation of image I at O itself.
(ii) What is the size of the image I?
(iii)State two more characteristics of the image I.
(iv) Name the distance of the objects O from the optical centre of the lens.
(v) To what point will the rays return if the mirror is moved away from the lens by a distance equal to the focal length of the lens ?


Match the columns in the following table and explain them.

Column 1 Column 2 Column 3
Farsightedness
Nearby object can be seen clearly
Bifocal lens
Presbyopia Far away object can be seen clearly Concave lens
Nearsightedness Problem of old age Convex lens

State whether the given statement is true or false:
A concave lens is a converging lens.


Make the correct choices in the following items : 

A converging lens B has the same focal length as a converging lens A, but only half the diameter, Both lens are used, separately, to form two images of building on a screen. which one of the follwing statements about the images is correct?

 


Aniket from Std. X uses spectacles. The power of the lenses in his spectacles is - 0.5 dioptre.
Answer the following questions:
  1. State the type of lenses used in his spectacles.
  2. Name the defect of vision Aniket is suffering from.
  3. Find the focal length of the lenses used in his spectacles.

State the nature and position of the object on the principal axis to obtain. A virtual and diminished image.


Draw a ray diagram to show the formation of an inverted and diminished image of an object by a lens. Name the lens used. State the position of the object with respect to the lens used. State one more characteristic of the image.


Draw the ray diagrams of a converging lens, when the object is placed at 2F on the principal axis. Write down the nature, position, and size of the image in both cases. Use only two rays in the diagrams.


Show, using a ray diagram, how a converging lens can be used to form a virtual image.


The given ray diagram illustrates the experimental set up for the determination of the focal length of a converging lens using a plane mirror.

(i) State the magnification of the image formed.
(ii) Write two characteristics of the image formed.
(iii) What is the name given to the distance between the object and optical centre of the lens in the above diagram?


A ray of light gets refracted ______ while entering the lens.


The point inside the lens on the principal axis through which light rays pass without changing their path is called _______.


Virtual image is formed by a convex lens if an object is placed _______.


In the convex lens if an object is placed at 2 F1, the image is formed at ______.


Find the odd one out and give its explanation.


When the incident ray is parallel to the principal axis, the refracted ray passes through the principal focus.


Write an Explanation.

Principal focus


Write an Explanation.

Principal axis


Write law in a given figure.


Write law in a given figure.


Write law in a given figure.


Explain with a ray diagram the position, size, and nature of the various image formed by convex lenses.

An object is at infinity.


The image formed by a lens is always virtual, erect and smaller in size than an object kept at different positions in front of it. Identify the nature of the lens.


State whether the following statement is True or False

A concave lens can be used to produce an enlarged and erect image.


State whether the following statement is True or False

A convex lens always produces a real image.


Observe the figures given in Figure 15.1 carefully.

The given figures show the path of light through lenses of two different types, represented by rectangular boxes A and B. What is the nature of lenses A and B?


Two different types of lenses are placed on a sheet of newspaper. How will you identify them without touching them?


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 be able to obtain the image on the screen? Explain.


A convex lens ‘A’ of focal length 20 cm and a concave lens ‘B’ of focal length 5 cm are kept along the same axis with a distance ‘d’ between them. If a parallel beam of light falling on ‘A’ leaves ‘B’ as a parallel beam, then the distance ‘d’ in cm will be ______.


A point object is placed at a distance of 60 cm from a convex lens of a focal length of 30 cm. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a distance of:


A convex lens ‘A’ of focal length 20 cm and a concave lens ‘B’ of focal length 5 cm are kept along the same axis with a distance ‘d’ between them. If a parallel beam of light falling on ‘A’ leaves ‘B’ as a parallel beam, then the distance ‘d’ in cm will be ______


A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a distance of :


Distinguish between:

Concave Lens and Convex Lens


Distinguish between:

Concave lens and Convex Lens


Share
Notifications



      Forgot password?
Use app×