Q10 of 55 Page 1

A student cannot see the chart hanging on a wall placed at a distance of 3 m from him. Name the defect on vision he is suffering from. How can it be corrected? Draw ray diagrams for the

(i) defect of vision and also


(ii) for its corrections.

Since the student is not able to see the objects which are at a distance of 3m, means that the student is suffering from Myopia.


It can be corrected by using the concave lens of suitable power.


The ray diagram to illustrate the defect and the correction diagram are as follows:



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(a) Name any four varieties of vegetables which have been produced from ‘wild cabbage’ by the process of artificial selection.

(b) Give one example of an evolutionary change produced is an organism for one purpose which later on becomes more useful for a different function.

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Subhash has started the project of constructing his building. His architect suggested that he should add a system of rain water harvesting in his building. He though by adopting water harvesting in his project he can solve his project he can solve his water crisis problem in the year to come.

(i) Is Subhash correct in his approach? Support your answer.


(ii) Give the value show by subhash.

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The image of a candle flame placed at a distance of 45 cm from a spherical lens is formed on a screen placed at a distance of 90 cm from the lens. Identify the type of lens and calculate its focal length. If the height of the flame is 2 cm, find the height of its image.

 12

state the type of mirror preferred as

(i) rear view mirror in vehicles


(ii) shaving mirror.


Justify your answer given two reasons in each case.