Kimp, Cathie, and Kai pointed three laser lights towards the sky as shown. How are the three lines of the laser light related to each other?

Q. Three lasers that are parallel to each other are directed towards a mirror. Which of the following depicts the reflection of light correctly?

Q. A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances.The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon’s surface. How much is the radius of the lunar orbit around the Earth ?

Q. A laser light beam passes through water and oil as shown below. If the time taken by the laser to pass through water is t, then the time taken by the same light beam in oil would be _______.​

Q. A laser projects light at a mirror. The mirror reflects the light as shown. The angle r is equal to _____ degree.

Q. Collimated light beams from a $He-Ne$ laser and a sodium vapour lamp (used for street lighting) are focused using a lens. The size of the spot at the focal point due to the laser is relatively smaller because