Answer in one word/one/sentence/ state/ define.
What is skip distance?

Answer in one word/one/sentence/ state/ define. What is critical frequency?

Answer in one word/ one sentence / state/ define. What is the wavelength range of x-rays.

Answer in one word/one/sentence/ state/ define. What do you mean by www of internet?

Answer in one word/ one sentence / state/ define. Which em wave is used in RADAR.

Answer in one word/ one sentence / state/ define. Which optical pehnomenon proves that light is a wave?

Answer in one word/ one sentence / state/ define. Which optical phenomenon established transverse nature of em waves?

Answer in one word/ one sentence / state/ define. Mention two uses each of concave mirror

Answer in one word/ one sentence / state/ define. If theta = 72^@ , find the number of images formed.

Answer in one word/ one sentence / state/ define. Mention two uses each of convex mirror

Answer in one word/ one sentence / state/ define. Name the regions of em spectrum having wavelengths just above and just below of those of the visible region.