| (i) The focal length of the eye lens increases when eye muscles are relaxed and lens becomes thinner. |
| (ii) Stars appear to twinkle because of movement of air only. |
| (iii) In the dim light, the size of pupil increases. |
| (iv) The blind spot on retina has high concentration of nerve ending. |
A)
(i)
(ii)
(iii)
(iv)
T
T
F
F
B)
(i)
(ii)
(iii)
(iv)
F
F
T
T
C)
(i)
(ii)
(iii)
(iv)
T
F
T
F
D)
(i)
(ii)
(iii)
(iv)
F
T
F
T
Correct Answer: C
Solution :
Stars appear to twinkle because o1 atmospheric refraction and movement of air. There is no nerve endings in blind spot and it is insensitive to light.
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