In order to explain the nature of light using the experimental results known in his time, Neils Bohr came up with a theory called the complementarity principle. Which of the following is the best explanation of this principle?

The critical angle for total internal reflection is a:

When total internal reflection happens at a plastic-air interface 

The figure below shows two vibrating particles. What is the phase difference between the two particles?

Which of these statements is true for the image formed by spherical mirror? 

Speed of light in vacuum is 3.0 x 108 m/s. Speed of light in glass is 2.0 x 108 m/s. What is the refractive index of glass?

What happens when two waves meeting at a point are in phase?

If two tuning forks of frequencies 256 Hz and 262 Hz are sounded together, you are likely to hear beats. What will be the beat frequency in this case?

Magnetic field lines satrts from N-pole and ends to S-pole.

Which of the following is a measure of the work done in moving a unit positive charge across two points in an electric circuit?