Question

Rohan placed a glass tub on the table and put a coin in it. He poured some water in the tub. He stood near the table from where he could see the coin. Now he slowly moved backwards from the table and reach to a position where he just missed the image of the coin. Now he asked his friendto pour some more water in the tub.He is able to see the coin again.

i.Identify the phenomenon related to this activity.(a)Reflection (c) Refraction(b)Dispersion (d) Scattering
2 nstead of water if he uses some other liquid, will he be able to see the coin from the same give reason
3 identify the condition for which a ray of light passing from one medium to another propogateswithout any deviation.

4 a ray of light moves from one medium to another. Name the physical quantity related to raythat remains unchanged and the one that changes.(a)Frequency & Velocity(c) Wavelength & Frequency(b)Energy & Wavelength (d) Velocity & Energ

Answer 1

Answer:

Combustion refers to the process where a substance burns in the presence of Oxygen, giving off heat and light in the process.

Answer 2

Answer:

Reflection

is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.