Cecil Barker's first reaction at the sight of the dead Douglas was to ______________.
a. inform Mr Woods.
b. stop Mrs Douglas from seeing the dead body.
c. call for help.
d. observe the open door.
How did the instructor “build a swimmer” out of Douglas?
The near point of a long-sighted person is 50 cm from the eye. (a) Can she see clearly an object at : (i) a distance of 20 cm ? (ii) at infinity ? (b) To read a book held at a distance of 25 cm, will she need converging or diverging spectacle lenses ?