Q3 of 10 Page 107


(a) MN represents a lens. What type of lens is this?


(b) What are the characteristics of the image?


(c) Copy the ray diagrams in the science diary and complete it.

a) MN is convex lens

As after refraction by the lens (MN) ray converge to focus (F), this only happen with convex lens (converging lens).


b) Image will be larger than object (enlarged), can be taken on the screen (Real) and upside down (inverted).


c) Ray diagram :


convex-lens-diagram.png


Object – OB


Image – O’B’


Image is Enlarged, Real and inverted.


More from this chapter

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2

The nature of images formed by two lenses are given.

(i) An erect and magnified virtual image


(ii) An erect and diminished virtual image


(a) What type of lens is used in each case?

 2

The nature of images formed by two lenses are given.

(i) An erect and magnified virtual image


(ii) An erect and diminished virtual image


On using which of these lenses will we get an image having the same size as the object? What is the position of the object?

 4

What do you mean by power of a lens? What is the SI unit of the power of a lens? Calculate the power of a concave lens of focal length 25 cm.

 5

Observer the figure. Light falling on two different media are shown.


(a) Which medium has greater optical density?


(b) Why?


(c) Which medium has a greater refractive index?