_______ times larger images can be obtained by using a simple microscope. - Science and Technology 1

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

Options

  • 5

  • 10

  • 20

  • 60

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Solution

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

Concept: Convex Lens
  Is there an error in this question or solution?
Chapter 7: Lenses - Choose the correct option.

RELATED QUESTIONS

A student wants to project the image of a candle flame on the walls of school laboratory by using a lens:-

(a) Which type of lens should be use and why?

(b) At what distance in terms of focal length 'F' of the lens should be place the candle flame so as to get (i) a magnified, and (ii) a diminished image respectively on the wall?

(c) Draw ray diagram to show the formation of the image in each case?


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.


When a ray of light enters from one medium to another having different optical densities it bends. Why does this phenomenon occur?


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) 


Define principal axis, principal focus and focal length of a convex lens.


Describe the nature of image formed when an object is placed at a distance of 30 cm from a convex lens of focal length 15 cm.


 An object 3 cm high is placed 24 cm away from a convex lens of focal length 8 cm. Find by calculations, the position, height and nature of the image.


An object is placed 20 cm from (a) a converging lens, and (b) a diverging lens, of focal length 15 cm. Calculate the image position and magnification in each case. 


Which causes more bending (or more refraction) of light rays passing through it : a convex lens of long focal length or a convex lens of short focal length?


Which part causes the greatest convergence?


What type of lens is used to correct  

hypermetropia


The diagrams (a) and (b) in Figure below show the refraction of a monochromatic ray of light through a parallel sided glass block and a prism respectively. In each diagram, label the incident, refracted emergent rays and the angle of deviation.

 


A converging lens forms the image of an object placed in front of it, beyond 2F2 of the lens.

State three characteristics of the image.


A convex lens forms an image of an object equal to the size of the object.Where is the object placed in front of the lens?


A lens forms an upright and magnified image of an object State whether the image is real or virtual


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


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.


Rewrite the following statement by selecting the correct option:
The power of a convex lens is 2.5 dioptres. Its focal length is ______________.

How will you decide whether a given piece of glass is a concave lens, convex lens, or a plane glass plate?


A concave mirror and convex lens are held in water. What changes, if any, do you expect in their focal length?


Which lens can produce a real and inverted image of an object?


Draw a diagram to show the convergent action of a convex lens by treating it as a combination of glass block and two triangular glass prisms, with the aid of two parallel incident rays.


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?


_______ is a combination of two convex lenses with small focal length.


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.


Differentiate convex lens and concave lens.


  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


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