Which Part Causes the Greatest Convergence? - Science

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Which part causes the greatest convergence?

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Solution

 The cornea is the part of the eye that causes the greatest convergence because light first enters the eye through the cornea, which is convex.

Concept: Convex Lens
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Chapter 6: The Human Eyes And The Colorful World - Exercise 1 [Page 272]

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Lakhmir Singh Class 10 Physics (Science)
Chapter 6 The Human Eyes And The Colorful World
Exercise 1 | Q 56.2 | Page 272

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RELATED QUESTIONS

To determine the approximate focal length of the given convex lens by focussing a distant object (say, a sign board), you try to focus the image of the object on a screen. The image you obtain on the screen is always

(a) erect and laterally inverted

(b) erect and diminished

(c) inverted and diminished

(d) virtual, inverted and diminished


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?


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

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What type of lens would you use as a magnifying glass? How close  must the object be to the lens?


Describe with the help of a ray diagram the nature, size and position of the image formed when an object is placed at infinity (considerable distance) in front of a convex lens. State three characteristics of the image so formed.


An object 4 cm high is placed at a distance of 10 cm from a convex lens of focal length 20 cm. Find the position, nature and size of the image.


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A parallel oblique beam of light falls on a (i) convex lens, (ii) concave lens. Draw a diagram in each case to show the refraction of light through the lens.


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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 

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


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

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


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Adults need bifocal lens spectacle.


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Differentiate convex lens and concave lens.


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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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