Q32 of 38 Page 1

The diagrams A and B represent the following relationship:

Both of them have different basic structure and origin but perform same function. So they are analogous organs.

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30

In the experiment on refraction of light through a rectangular glass slab done by four students A, B, C and D, the following observations were made:

(a) The emergent ray moves towards the normal after second refraction through glass slab with i = e


(b) The emergent ray moves away from the normal after second refraction through glass slab ∠ i < ∠e


(c) For any angle of incidence, always ∠I ˃ ∠e, always.


(d) The emergent ray moves away from normal after second refraction through glass slab with ∠i = ∠e


The student who has made the correct observation is:

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To trace the path of ray of light through the triangular glass prism, a student observes that the emergent ray has

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Identify the parts labeled 1 and 2 in the adjoining figure

 34

When you add sodium hydrogen carbonate to acetic acid in a test tube, a gas liberates immediately with a brisk effervescence. None the gas and describe the method of its testing in the laboratory.