Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 10

Differentiate convex lens and concave lens. - Science

Advertisements
Advertisements
Distinguish Between

Differentiate convex lens and concave lens.

Advertisements

Solution

Convex Lens Concave Lens
1. The lens which is thicker at the centre than at the edges. 1. The lens is thinner at the centre than at the edges.
2. Abeam of light passing through it, is converged to a point. 2. A beam of light passing through it is diverged or spread out.
3. It is called a converging lens. 3. It is called a diverging lens.
Concept: Convex Lens
  Is there an error in this question or solution?
Chapter 2: Optics - Evaluation [Page 30]

APPEARS IN

Tamil Nadu Board Samacheer Kalvi Class 10th SSLC Science Answers Guide
Chapter 2 Optics
Evaluation | Q VI. 6. | Page 30

RELATED QUESTIONS

"A lens can form a magnified erect image as well as magnified inverted image of an object placed in front of it." State the nature of this lens and draw ray diagrams to justify the above statement. Mark the positions of O, F and 2F in the diagram.


A lens forms an upright and diminished image of an object when the object is placed at the focal point of the given lens.

1) Name the lens

2) Draw a ray diagram to show the image formation.


Complete the following table:

Instrument Number of Convex
Lenses
Use
Simple Microscope .............. ..............
Compound Microscope .............. ..............
Telescope .............. ..............

Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block:  

if it hits the glass block at 90° (that is, perpendicular to the glass block) 


What is a lens? 


 List some things that convex lens and concave mirror have in common.  


A convex lens of focal length 6 cm is held 4 cm from a newspaper which has print 0.5 cm high. By calculation, determine the size and nature of the image produced.


 Find the nature, position and magnification of the images formed by a convex lens of focal length 0.20 m if the object is placed at a distance of: 

 0.15 m 


Define the term principal foci of a convex lens and illustrate your answer with the aid of proper diagrams.


Where is the image formed?


A convex lens forms an image of an object equal to the size of the object.state two more characteristics of the image.


Classify as real or virtual, the image of a candle flame formed on a screen by a convex lens. Draw a ray diagram to illustrate how the image is formed.


In the following cases, where must an object be placed in front of a convex lens so that the image formed is at infinity.


In the following cases, where must an object be placed in front of a convex lens so that the image formed is upright and enlarged image?


A student focussed the image of a distant object using a device ‘X’ on a white screen ‘S’ as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device.

(A) The device X is a convex lens of focal length 20 cm.

(B) The device X is a concave mirror of focal length 40 cm.

(C) The device X is a convex mirror of radius of curvature 40 cm.

(D) The device X is a convex lens of focal length 40 cm.


For finding the focal length of a convex lens by obtaining the image of a distant object, one should use as the object. 

(1) a well lit distant tree 

(2) window grill in the class room 

(3) any distant tree 

(4) a lighted candle kept at the other end of the table. 


Distinguish between:

Concave lens and Convex lens


i. Which type of microscope has the arrangement of lenses shown in the  adjoining figure?
ii. Label the figure correctly.
iii. Write the working of this microscope.
iv. Where does this microscope used?
v. Suggest a way to increase the efficiency of this microscope.


The image obtained while finding the focal length of convex lens is ....................


Observe the following figure and answer the questions.

a) Which optical instrument shows arrangement of lenses as shown in the figure?
b) Write in brief the working of this optical instrument.
c) How can we get different magnifications in this optical instrument?
d) Draw the figure again and labelled it properly


Yesh find out F1 and F2 of symmetric convex lens experimentally then which conclusion is true.


Observe the following figure and complete the table:

Points Answer
(i) Position of the object  
(ii) Position of the image  
(iii) Size of the image   
(iv) Nature of the image  

If an object is placed in front of a convex lens beyond 2F1, then what will be the position, relative size, and nature of an image which is formed? Explain with a ray diagram.


Answer the following question.
List four precautions which a student should observe while determining the focal length of a given convex lens by obtaining an image of a distant object on a screen. 


Point out the difference between a convex lens and a concave lens.


Can a normal convex lens behave like a concave lens and vice-versa?


We can burn a piece of paper by focussing the sun rays by using a particular type of lens. Name the type of lens used for the above purpose. Draw a ray diagram to support your answer.


For a specific glass lens f = 0.5 m. This is the only information given to the student. Which type of lens is given to him and what is its power?


_______ times larger images can be obtained by using a simple microscope.


Object at 2F1 of a convex lens : Image at 2F2 : : Object at F1 : _______


Simple microscope : Number of convex lens one : : compound microscope : _______


: Object near the lens : : ______ :


Find the odd one out and give its explanation.


Find the odd one out and give its explanation.


Write the name.

The lens used in simple microscope.


Write scientific reason.

Adults need bifocal lens spectacle.


Observe the given figure and answer the following questions.

  1. Where is the above type of lens construction used?
  2. What type of image is formed by an objective lens?
  3. What happens instead of placing at Fo if the object is placed in between O and Fo?

A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images?


  1. In which type of microscope do you find the lens arrangement as shown in the following diagram?
  2. Write about the working and the use of this microscope.

Distinguish between Concave lens and Convex lens.


Distinguish between:

Concave lens and Convex Lens


Distinguish between Concave lens and Convex Lens.


Distinguish between:

Concave lens and Convex Lens


Distinguish between:

Concave lens and Convex Lens


Share
Notifications



      Forgot password?
Use app×