Q6 of 31 Page 185

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

A convex lens of focal length 5 cm is used for reading small letters. Thus, option (c) is correct.

More from this chapter

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4

A spherical mirror and a thin spherical lens each have a focal length of, -15 cm. The mirror and the lens are likely to be:

 5

No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be:

 7

We wish to obtain an erect image of an object using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.

 8

Name the type of mirror used in the following situations :

(a) Headlights of a car


(b) Side/rear view mirror of a vehicle


(c) Solar furnace


Support your answer with reason.