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.
Gamma rays, ultraviolet rays, X- rays, infra - red rays
Gamma rays, X-rays, ultraviolet rays, infra-red rays
infra-red rays, ultraviolet rays, X-rays, gamma rays
Gamma rays, ultraviolet rays, infra-red rays, X-rays
Correct answer is B
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 = \(\frac{1}{n}\) = \(\frac{1}{2}\)
c = sin-1\((\frac{1}{n})\)
= 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 = \(\frac{3 \times 10^8}{v}\)
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.