Question

51. a) What is a lens ? Name the two types of lenses Namen
lame the two types of lenses Name any five things which use lenses.
(b) What kind of lens is used as a magnifying glass
(C) Which type of reflector is used in car headlights for producing a para
52 ( Whatis meant by disnersion of light Name a natural phenomen
of light Name a natural phenomenon which is caused by the dispe​

Answer 1

Answer:

a)  Lens is a piece of transparent material (such as glass) that has two opposite regular surfaces either both curved or one curved and the other plane and that is used either singly or combined in an optical instrument for forming an image by focusing rays of light. b : a combination of two or more simple lenses.

There are two type of lens-:

• Concave lens

• Convex lens

Five things that uses lens are:

• Binoculars and Telescopes
• Glasses
• Cameras
• Flashlights

• Lasers.

b) Convex lens is used in magnifying glass.

c) Convex lens is used in car headlights.

52) The process of splitting of white light into seven colours is called dispersion of light.

Formation of rainbow is a natural phenomena caused by dispersion of light.