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CBSE Class 10 Science Solved Question Paper 2012

Short Answer Type

21.

State one role of ciliary muscles in the human eye?

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22. To construct ray diagram we use two light rays which are so chosen that it is easy to know their directions after reflection from the mirror. List these two rays and state the path of these rays after reflection. Use these rays to locate the image of an object placed between centre of curvature and focus of a concave mirror.

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23.

What is the colour of the sky during day time? Give reason for it?

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24.

Draw a labelled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism.

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25. A 5 cm tall object is placed perpendicular to the principle axis of a convex lens of focal length 12 cm. The distance of the object from the lens is 8 cm. Using the lens formula, find the position, size and nature of the image formed.

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26.

State the types of mirrors used for: i) headlights and ii) rear view mirror, in cars and motorcycles. Give to justify your answer in each case.

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27. An old man cannot see objects closer than 1 m from the eye clearly. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagram for the:

(i) defect of vision and also (ii) for its correction.

When a person cannot see objects closer than 1 m from the eye, he is suffering from presbyopia.

Presbyopia is a common defect of vision, which generally occurs at old age. A person suffering from this type of defect of vision cannot see nearby objects clearly and distinctively. A presbyopic eye has its near point greater than 25 cm and it gradually increases as the eye becomes older.

Presbyopia is caused by the:
1. gradual weakening of the ciliary muscles,

2. reduction of flexibility in the eye lens.

Presbyopia can be corrected by using a convex lens of appropriate power.

i) Ray diagram showing presbyopia is as shown below: