Q16 of 58 Page 1

Draw the following diagram, in which ray of light is incident on a concave/convex mirror, on your answer sheet. Show the path of this ray, after reflection, in each case.

(i) When a ray, passing through focus strikes concave or convex mirrors, the reflected ray will pass parallel to the principle axis. The size of image formed is same as the object, is placed at centre of curvature.



(ii) The ray of light going through focus of a convex mirror becomes parallel to the principal axis after reflection.



(iii) A ray of light which is incident at the pole of a convex mirror is reflected back making the same angle with the principal axis. Thus angle of incidence i is equal to the angle of reflection r.



More from this chapter

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14

In one of his experiments with pea plants Mendel observed that when a pure tall pea plant is crossed with a pure dwarf pea plant, in the first generation, F1, only tall plants appear.

(a) What happens to the traits of the dwarf plants in this case?


(b) When the F1 generation plants were self-fertilized, he observed that in the plants of second generation, F2, both tall plants and dwarf plants were present. Why it happened? Explain briefly.

 15

List three distinguishing features, in tabular form, between acquired traits and the inherited traits.

 17

Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an observer on the moon? Justify your answer with a reason.

 18

Give reason to justify the following:

(a) The existence of decomposers is essential in a biosphere.


(b) Flow of energy in a food chain is unidirectional.