Question

Science Worksheet - 1
Ch 11 Human Eye and the colourful World
Topic: Human Eye & Defects of Vision
: 27/04/2020
Q-1 Multiple Choice Questions:
1) In human eye, the image of an object is formed at
A) iris
) pupil O retina D cornea
2) The focal length of an Eyelens is changed due to the activity of
A) pupil
Bretina C ellary muscles Dicornea
3) What is used to remove the detect of near-siehtedness?
Al Convex lens
B) Concave lens Bifocal lens
D) Concave mirror
4) Where is the image in an eye formed in a person suffering from the defect of far-
sightedness?
A) On retina
B) On backward region of retina
C) On a region ahead of retina D) On pupil
5) What is used to remove the defect of far-sightedness?
A) Concave lens B) Convex lens
C) Bifocal lens D) None of these
6) in the defect of Presbyopia, the person
A) Cannot see at a distance
B) Difficult to see nearby objects
C) Cannot see at a distance and also nearby D) None of these
7) In bifocal lens concave and convex, both lenses are used. Persons having defect of
need spectacles with bifocal lens.
P- Near-sightedness, Q- Far-sightedness, R- Night blindness
A) only Q. B) only R C) P and Q both D) only
0.2. Answer the following Questions:
Draw the Human Eve with proper Labelling,
Name all the important parts of Human Eye.
Which part of Human eye send the Electric signals to the brain?
What is the function of Retina?
Lens is controlled by whom?
Explain the defect of Myopia.
Explain the defect of Hypermetropia.
Explain the defect of Presbyopia
NMON​

Answer 1

Answer:

Explanation:

1)RETINA.

2)CILLIARY MUSCLES.

3)CONCAVE LENS

4)ON THE BACKWARD REGION OF RETINA.

5)CONVEX LENS

6)DIFFICULT TO SEE NEARBY OBJECTS.

7)BOTH P AND Q

[2]

A) OPTICAL NERV E.

B)ACT AS A FRAME/SCREEN FOR THE FORMATION OF THE INVERTAED IMAGE OF THE OBJECT.

C)CILLIARY MUSCLES.

D)MYOPIA / SHORT SIGHT IS CAUSED DUE TO LARGE EYE BALL AND HENCE THE IMAGE IS FORMED IN FRONT OF RATINA

CAN SEE NEARBY OBJECTS BUT CANNOT SEE FAR AWAY OBJECTS.CORRECTED USING CONCAVE LENS.

E) HYPER METROPIA/ LONG SIGHT IS CAUSED DUE TO SMALL EYE BALL AND HENCE THE IMAGE IS FORMED BEHIND THE RETINA.

CAN SEE FAR AWAY OBJECTS BUT CANNOT SEE NEAR BY OBJECTS.CORRECTED USING CONVEX LENS.

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