The angle between the direction of the earth's magnetic field and the horizontal is called the
angle of deviation
magnetic declination
magnetic meridian
angle of dip
Correct answer is D
No explanation has been provided for this answer.
If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
30o
42o
45o
50o
Correct answer is A
sin c = 1n = 12
c = sin-1(1n)
= 30o
1.5 x 108ms-1
3.0 x 108ms-1
2.0 x 108ms-1
6.0 x 108ms-1
Correct answer is C
1.5 = 3×108v
v = 2.0 x 108ms-1
Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?
He cannot see distant objects clearly
Rays of light from a close object are focused in front of his retina
His eye ball is too long
Parallel rays of light are focused behind his retina
Correct answer is D
No explanation has been provided for this answer.