A light ray travels from air into an optical fibre with an index of refraction of 1.45. If the angle of incidence on the end of the fibre is 22°, the angle of refraction inside the fibre is:
One-third of a certain journey is covered at a speed of 25 km/h, one-fourth of the journey is covered at a speed of 30 km/h and the rest of the journey is covered at 50 km/h. The average speed (in km/h) of the whole journey is:
Study the given letter, number, symbol series and answer the question that follows.
(Left) T ? L % 4 M 2 # B N @ 8 K # B 6 L * 3 P (Right)
How many such numbers are there that are immediately preceded by a symbol and also immediately followed by a letter?
Amongst six people, D, E, F, G, H, and I, each has a different age. They are standing in a line according to their age in an increasing order. F is older than E but younger than D. D is younger than I. E is older than G. G is older than H. Who comes in the 4th position in increasing order of age?
Simplify:
\(\left(\frac{1}{512}\right)^{-\frac{2}{3}}\div\left(\frac{1}{64}\right)^{-\frac{4}{3}}\)
\(\frac{2}{3}\)
\(\frac{3}{4}\)
\(\frac{1}{4}\)
\(\frac{1}{6}\)