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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

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? - Science and Technology 1

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प्रश्न

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?
टीपा लिहा
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उत्तर

  1. The above type of lens construction is used in a compound microscope.
  2. The image formed by the objective is real, inverted, and formed at a distance within the focal length of the eyepiece.
  3. If the object is placed in between O and Fo, a virtual image will be formed on the same side of the objective as that of the object. As a result, compound microscope will not be able to operate as expected.
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पाठ 7: Lenses - Answer the Following

संबंधित प्रश्‍न

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?


Analyse the following observation table showing variation of image-distance (v) with object-distance (u) in case of a convex lens and answer the questions that follow without doing any calculations : 

S. No. Object-Distance
u (cm)
Image-Distance
v (cm)
1 –100 +25
2 –60 +30
3 –40 +40
4 –30 +60
5 –25 +100
6 –15 +120

(a) What is the focal length of the convex lens? Give reason to justify your answer.

(b) Write the serial number of the observation which is not correct. On what basis have you arrived at this conclusion?

(c) Select an appropriate scale and draw a ray diagram for the observation at S.No. 2. Also find the approximate value of magnification.
 


Where should an object be placed so that a real and inverted image of the same size as the object is obtained using a convex lens?


Three convex lenses are available having focal lengths of 4 cm, 40 cm and 4 m respectively. Which one would you choose as a magnifying glass and why? 

 


An object is placed f and 2f of a convex lens. Which of the following statements correctly describes its image? 

(a) real, larger than the object
(b) erect, smaller than the object
(c) inverted, same size as object
(d) virtual, larger than the object


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:  

 0.25 m 


Which type of lenses are: 

thicker in the middle than at the edges?


A lens forms an inverted image of an object. Name the kind of lens.


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


Complete the following table: 

Type of lens Position of object Nature of image Size of image
Convex Between optical centre and focus    
Convex At focus    
Concave At infinity    
Concave At any distance    

A student places a 8.0 cm tall object perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. He obtains a sharp image of the object on a screen placed on the other side of the lens. What will be the nature (inverted, erect, magnified, diminished) of the image he obtains on a screen? Draw ray diagram to justify your answer.


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. 


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


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


A convex lens forms an inverted image of size same as that of the object which is placed at a distance 60 cm in front of the lens. Find: The position of image


State two applications of a convex lens.


What is the difference between a double convex and a bi-convex lens?


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


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


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