Find the odd one out and give its explanation. Focal length, Radius of curvature, Image distance, Size of image - Science and Technology 1

Advertisements
Advertisements
MCQ

Find the odd one out and give its explanation.

Options

  • Focal length

  • Radius of curvature

  • Image distance

  • Size of image

Advertisements

Solution

Size of image

Explanation-

All the other distances are measured from the optical center along the principal axis while the size of the image is measured perpendicular to the axis.

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

RELATED QUESTIONS

State the position of the object in front of a converging lens if It is used as a magnifying lens.


Show by a ray diagram that a diverging lens cannot form a real image of an object placed anywhere on its principal axis.


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


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

Draw a figure explaining various terms related to a lens.


Distinguish between:

Farsightedness and Nearsightedness.


Distinguish between:

Concave lens and Convex lens.


The instrument used to observe planets.

How are the distance of object (u), the distance of image (v), and focal length (f) of a lens-related?


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.


Write down the characteristic of the image formed when the object is between F and 2F?


Define the principal axis.


Define the optical centre of a lens.


How does a convex lens act as a ‘converging lens’?


How does a concave lens act as a ‘diverging lens’?


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 _______.


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


The image formed by _______ lens is always virtual and small.


Find the odd one out and give its explanation.


Write the name.

The imaginary line passing through two optical centres of lens


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


The virtual image of object seen by the eye depends on the angle subtended by the object with the eye.


Write an Explanation.

Centre of curvature of the lens


Write an Explanation.

The optical centre of the lens


Write an Explanation.

Principal focus


Write an Explanation.

Focal length


Write an Explanation.

Principal axis


Write law in a given figure.


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 :


Share
Notifications



      Forgot password?
Use app×