Question

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Answer 1

1. Cornea

2. Most of the light from the atmosphere is absorbed by the pupil and only small amount is reflected back.thus pupils are black / dark.

3. a) Rod shaped cells : They are helpful in achromatic night vision.Found in the periphery of retina.

Cone shaped cells :They are helpful in colored day vision.Found in the centre of retina.

b)Near point: closest point where the human eye can focus on.

Far point: Farthest point where the human eye can focus on.

4. a)Myopia: It is a defect in which the nearby objects can be seen clearly and not the far objects.Its also known as short sightedness.It can be corrected using concave lens.

Hypermetropia:It is a defect in which far objects can be seen clearly and not the nearby objects.It is known as far sightedness.It can be corrected by convex lens.

b) Tactual aids:Sensory involved in touch sense.

Auditory aids: Sensory involved in hearing sense.

5.a) Blind spot: Blind spot is a spot at retina where there is no rods or cones.This spot donot play any role in vision.

b) Persistence of vision: Persistence is an illusion created due to lagging of light rays that enter into the eyes.

6. a)Power of accomodation: it is the change in the focal length of the lens according to the need and position of the object.

b)least distance of distinct vision: It is the minimum distance between the lens and the nearby object.

c) range of vision: It is the minimum to maximum distance between the lens and the nearby or far away object.

7. The image distance in the eye increases with increase the distance between the object and eye.