Q13 of 24 Page 82

Observe the figures given as Figure 15.1 carefully. Fig 15.1


The given figures show the path of light through lenses of two different types, represented by rectangular boxes A and B. What is the nature of lenses A and B?

Box A - covex lens

Box B - concave lens


in given figure, nature of lens A is convex as the convex lens generally converges the light rays falling on it i.e it bends the rays inwards. Convex lens is also called 'converging lens’.


nature of lens B is concave as the concave lens generally diverges the light rays falling on it i.e it bends the rays outwards. Concave lens is also called 'Diverging lens’.


More from this chapter

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11

State whether the following statements are True or False.

(a) A concave lens can be used to produce an enlarged and erect image.


(b) A convex lens always produces a real image.


(c) The sides of an object and its image formed by a concave mirror are always interchanged.


(d) An object can be seen only if it emits light.

 12

What type of mirror is used as a side mirror in a scooter? Why is this type of mirror chosen?

 14

Boojho made light from a laser torch to fall on a prism. Will he be able to observe a band of seven colours? Explain with a reason.

 15

State the correct sequence (1-7) of colours in the spectrum formed by the prisms A and B, shown in Figure 15.2.