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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.

In order to locate the image, any two rays can be chosen.

i) a ray which is parallel to the principal axis, after reflection will pass through the principal focus in case of a concave mirror and diverge from the principal axis in case of a convex mirror.

ii) A ray passing through the principal focus will emerge parallel to the principal axis after reflection.

When an object is placed between the centre of curvature and focus of a concave mirror, the ray diagram is as shown below:

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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.

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