Q13 of 223 Page 198

At what distance from a concave mirror of focal length 10 cm should an object 2 cm long be placed in order to get an erect image 8 cm tall ?

f=-10cm, h1=2cm, h2=8cm (erect image)

u =?


We know that:



The object should be placed at a distance of 7.5 cm on the left side of the mirror.


More from this chapter

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11

An object is placed at a distance of 10 cm from a concave mirror of focal length 15cm.

(a) Draw a ray diagram for the formation of image.


(b) Calculate the image distance.


(c) State two characteristics of the image formed.

 12

If an object of 10 cm height is placed at a distance of 24 cm from a concave mirror of focal length 12 cm, find the position, nature and height of the image.

 14

When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror. Calculate the radius of curvature of the mirror.

 15

An object 3 cm high is placed at a distance of 8 cm from a concave mirror which produces a virtual image 6 cm high:

(i) What is the focal length of the mirror?


(ii) What is the position of image?


(iii) Draw a ray-diagram to show the formation of image.