A Lens Always Forms an Image Between the Object and the Lens. - Physics

One Line Answer

A lens always forms an image between the object and the lens. 

name the lens.



The lens that forms the image between the object and itself is a concave lens.

Concept: Concave Lens
  Is there an error in this question or solution?
Chapter 5: Refraction through a Lens - Exercise 5 (B) 1 [Page 120]


Selina Concise Physics Class 10 ICSE
Chapter 5 Refraction through a Lens
Exercise 5 (B) 1 | Q 12.1 | Page 120


If the numerical value of the power of this lens is 10 D, what is its focal length in the Cartesian system ? 

Explain with the help of a diagram, why the concave lens is also called a diverging lens.

Define the principal focus of a concave lens.  

If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19 cm from the lens, the image formed is slightly larger than object. The approximate focal length of the lens is ______.

Take down this figure into your answer book and complete the path of the ray. 

How would a pencil look like if you saw it through 

a concave lens  Is the image real or virtual?

A beam of light is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the following figure:

The box contains:
(a) a glass prism
(b) a concave lens
(c) a convex lens
(d) a parallel-sided glass slab

The power of a converging lens is 4.5 D and that of a diverging lens is 3 D. The power of this combination of lenses placed close together is :
(a) +1.5D
(b) +7.5D
(c) −7.5D
(d) −1.5D

A person cannot see distant objects clearly. His vision can be corrected by using the spectacles containing:
(a) concave lenses
(b) plane lenses
(c) contact lenses
(d) convex lenses

Out of the two lenses, one concave and the other convex, state which one will show the divergent action on a light beam.

An object is placed on the axis of a lens. An image is formed by refraction in the lens. For all positions of the object on the axis of the lens, the positions of the image are always always between the lens and the object name the lens.

Where will the image be formed if an object is kept in front of a concave lens at a distance equal to its focal length? Draw a ray diagram to illustrate your answer.

A lens forms an upright and diminished image of an object irrespective of its position. What kind of lens is this?

State the changes in the position, size and nature of the image of an object when brought from infinity up to a concave lens. Illustrate your answer by drawing ray diagrams.

Complete the following sentence:

an object is placed at a distance 2f from a convex lens of focal length f. The size of image formed is ………….. that of the object.


A concave lens forms the image of an object which is:

Explain the working of an astronomical telescope using refraction of light.


A student obtained clear image of window grills on the screen. But the teacher told him to get the image of a tree far away, instead of window. To get a clear image,  the lens must be ............................

Which lens is converging:

A concavo-convex lens or a convexo-concave lens?

A concave lens forms an erect image of 1/3rd size of the object which is placed at a distance 30 cm in front of the lens. Find -

  1.  the position of image, and
  2. the focal length of the lens.

Choose the correct alternative and rewrite the following: 

Inside water, an air bubble behaves ....................

An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm.
(i) Use the lens formula to find the distance of the image from the lens.
(ii) List four characteristics of the image (nature, position, size, erect/inverted) formed by the lens in this case.
(iii) Draw a ray diagram to justify your answer of the part (ii).

Draw images in case of a concave lens when the object is at any point on the principal axis between the lens and infinity.

Convex lens : converging : : concave lens : _______

Convex magnifying glass is called divergent magnifying glass and concave magnifying glass is called converging magnifying glass.

Distinguish between Concave lens and Convex Lens.

Distinguish between:

Concave Lens and Convex Lens


      Forgot password?
Use app×