Q2 of 58 Page 1

What happens when a Planaria gets cut into two pieces?

When the body of Planaria is cut into pieces by any means, specialized cells in each piece proliferates and grows into a large number of cells. From this cellular mass the cells undergo differentiation and further form various cell types, tissues, and develop a complete new organism.


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22

(a) Draw a ray diagram to show the formation of image by a concave lens when an object is placed in front of it.

(b) In the above diagram mark the object-distance (u) and the image-distance (v) with their proper signs (+ve or -ve as per the new Cartes. ian sign convention) and state how these distances are related to the focal length (f) of the concave lens in this case.


(c) Find the nature and power of a lens which forms a real and inverted image of magnification -1at a distance of 40 cm from its optical center.

 1

Select saturated hydrocarbons from the following :

C3H6 ; C5H10 ; C4H10 ; C6H14 ; C2H4

 3

Why are green plants called producer?

 4

What is meant by power of a lens? What does its sign (+ve or -ve) indicate? State its S.I. unit. How is this unit related to focal length of a lens?