Q18 of 25 Page 94

What kind of lens is there in our eyes? Where does it form the image of an object?

Our eyes have convex lens which is thicker at the middle.

It converges all the light that enters into our eyes and forms the image of the object at the back of the eye on a layer called retina.


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16

Look at Fig.16.7. Can the image of the child in it be obtained on a screen?


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Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?

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Which part of the eye gets affected if someone is suffering from cataract? How is it treated?

 20

Boojho planned an activity to observe an object A through pipes as shown in Fig. 16.8, so that he could see objects which he could not directly see.


(a) How many mirrors should he use to see the objects?


(b) Indicate the positions of the mirrors in the figure.


(c) What must be the angle with respect to the incident light at which he should place the mirrors?


(d) Indicate the direction of rays in the figure.


(e) If any of the mirrors is removed, will he be able to see the objects?