Match the column I with column II and select the correct option from the codes given below. Column I Column II a Choroid i Detects light stimulus b Retina ii Absorbs light and prevent it from being reflected within the eyeball c Cornea iii Controls the size of the pupil d Iris iv Helps to focus light as it enters the eye

( a ) - ( ii ) , ( b ) - ( i ) , ( c ) - ( iv ) , ( d ) - ( iii )

( a ) - ( i ) , ( b ) - ( ii ) , ( c ) - ( iii ) , ( d ) - ( iv )

( a ) - ( ii ) , ( b ) - ( iii ) , ( c ) - ( iv ) , ( d ) - ( i )

( a ) - ( iii ) , ( b ) - ( iv ) , ( c ) - ( i ) , ( d ) - ( ii )

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10th Foundation

IMPORTANT

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An optician while testing the eyes find the vision of a patient to be $6 / 9$ . By this he means that:

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Important Questions on Human Eye and Colourful World

HARD

10th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 10>Chapter 10 - Human Eye and Colourful World>EXERCISES>Q 8

Figures $(i), (ii), (iii) & (iv)$ respectively correspond to:

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10th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 10>Chapter 10 - Human Eye and Colourful World>EXERCISES>Q 9

Read the given statements and mark the correct option.
Statement

1 :

A normal human eye can clearly see all the objects below and above

25 m

.
Statement

2 :

The human eye has the capacity to suitably adjust the focal length of its lens to a certain extent.

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10th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 10>Chapter 10 - Human Eye and Colourful World>EXERCISES>Q 10

A passenger in an aeroplane:

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10th Foundation

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NSO Science Olympiad Workbook Grade 10>Chapter 10 - Human Eye and Colourful World>EXERCISES>Q 11

In a room, artificial rain is produced at one end and a strong source of white light is switched on at the other end. To observe the rainbow an observer must:

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10th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 10>Chapter 10 - Human Eye and Colourful World>EXERCISES>Q 12

Match the column $I$ with column $II$ and select the correct option from the codes given below.

Column $I$		Column $II$
$(a)$	Choroid	$(i)$	Detects light stimulus
$(b)$	Retina	$(ii)$	Absorbs light and prevent it from being reflected within the eyeball
$(c)$	Cornea	$(iii)$	Controls the size of the pupil
$(d)$	Iris	$(iv)$	Helps to focus light as it enters the eye

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10th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 10>Chapter 10 - Human Eye and Colourful World>EXERCISES>Q 13

A person needs a lens of power

2.5 D

for correction of her vision. Read the given sentences and then select the correct option:

(i)

Focal length of the lens is

40 cm

(ii)

Focal length of the lens is

- 40 cm

(iii)

Nature of the lens is concave.

(iv)

Nature of the lens is convex.

(v)

She is suffering from myopia.

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10th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 10>Chapter 10 - Human Eye and Colourful World>EXERCISES>Q 14

The lens of the eye can become thicker and thinner. Why is this flexibility useful?

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10th Foundation

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NSO Science Olympiad Workbook Grade 10>Chapter 10 - Human Eye and Colourful World>EXERCISES>Q 15

A prism $A B C$ (with $B C$ as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

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An optician while testing the eyes find the vision of a patient to be 6/9. By this he means that:

Important Questions on Human Eye and Colourful World

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An optician while testing the eyes find the vision of a patient to be $6 / 9$ . By this he means that: