Question

give one word.

27. What kind of image cannot be obtained on a screen?
28. Which type of mirror and lens used to form a real image?
29. Light of which colour-red or violet, travels faster?
30.Write down the characteristics of image formed by convex and concave
31. A lens that can be used as a simple microscope.
32 Which bacteria decomposes the biodegradable contaminants present in
the clarified water?
33. What is the setup used for purification of waste water called?
34 Name a waterborne disease.
35. What kind of waste is sewage?
36.Name the chemical used to disinfect water.​

Answer 1

Answer:

An image which can be obtained on a screen is called a real image. An image which cannot be obtained on a screen is called a virtual image. The image formed by a plane mirror is erect. It is virtual and is of the same size as the object.