हिंदी

Observe the Following Figure and Answer the Questions.

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प्रश्न

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

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उत्तर

a) Arrangement of lenses shown in the figure is refracting telescope.
b) 1) object lens collect the light coming form the distant object and forms the image
2)The image works as object for the eye piece which forms the final image.
c) We can get different magnifications by using the eye piece with different focal lengths.

d)

 

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2018-2019 (March) Balbharati Model Question Paper Set 2

संबंधित प्रश्न

An object of height 2.5 cm is placed at a distance of 15 cm from the optical centre 'O' of a convex lens of focal length 10 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical 'O', principal focus F and height of the image on the diagram.


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Write one condition where it does not bend when entering a medium of different optical density.


Draw a ray diagram to show the formation of the image of an object be placed so that a real and inverted image of the same size as the object is obtained using a convex lens


An object is placed at a distance of 12 cm from a convex lens of focal length 8 cm. Find :

1) the position of the image

2) nature of the image


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How could you find the focal length of a convex lens rapidly but approximately? 


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 What type of images can a convex lens make?


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What kind of lens can form: 

 an inverted magnified image? 


Where is the image formed?


List four properties of the image formed by a convex mirror.


The focal length of a lens is positive. In this case, state the kind of lens.


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The power of a convex lens is 2.5 dioptres. Its focal length is ______________.

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