मराठी
तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता १०

Magnification of a convex lens is ______. - Science

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प्रश्न

Magnification of a convex lens is ______.

पर्याय

  • Positive

  • negative

  • either positive or negative

  • zero

MCQ
रिकाम्या जागा भरा
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उत्तर

Magnification of a convex lens is either positive or negative.

Explanation:

A convex lens can form real or virtual images depending on the position of the object. If the image is real and inverted, the magnification is negative. If the image is virtual and erect, the magnification is positive. Therefore, magnification of a convex lens is either positive or negative.

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पाठ 2: Optics - Evaluation [पृष्ठ २९]

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सामाचीर कलवी Science [English] Class 10 SSLC TN Board
पाठ 2 Optics
Evaluation | Q I. 4. | पृष्ठ २९

संबंधित प्रश्‍न

The image formed by a spherical mirror is real, inverted and is of magnification −2. If the image is at a distance of 30 cm from the mirror, where is the object placed? Find the focal length of the mirror. List two characteristics of the image formed if the object is moved 10 cm towards the mirror.


An object is placed (a) 20 cm, (b) 4 cm, in front of a concave mirror of focal length 12 cm. Find the nature and position of the image formed in each case.


In order to obtain a magnification of, −1.5 with a concave mirror of focal length 16 cm, the object will have to be placed at a distance 

(a) between 6 cm and 16 cm
(b) between 32 cm and 16 cm
(c) between 48 cm and 32 cm
(d) beyond 64 cm


Explain what is meant by a virtual, magnified image. 


Draw a ray diagram to show how a converging lens is used as a magnifying glass to observe a small object. Mark on your diagram the foci of the lens and the position of the eye.


At which position will you keep an object in front of a convex lens so as to get a real image of the same size as the object? Draw a figure.


Give a scientific reason.

Simple microscope is used for watch repairs.


A lens forms the image of an object placed at a distance 15 cm from it, at a distance 60 cm in front of it. Find the magnification.


A lens of focal length 5 cm is being used by Debashree in the laboratory as a magnifying glass. Her least distance of distinct vision is 25 cm.

  1. What is the magnification obtained by using the glass?
  2. She keeps a book at a distance 10 cm from her eyes and tries to read. She is unable to read. What is the reason for this?

The magnification by a lens is -3. Name the lens and state how are u and v related?


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