1.

(ii) A student conducts an experiment using a concave mirror with focal length of30cm. He places an object at a distance of 20cm in front of the mirror. Where is theimage likely to form?(a) 10cm in front of the mirror(c) 30 cm behind the mirror(b). 20 cm in front of themirror(d) 60 сm behind the mirror

Answer»

Explanation:

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so here we go

now here concave MIRROR ,,

focal LENGTH (F)=-30 cm

object distance (u)=20 cm

so we have to image distance ie v

so apply mirror formula ie

1/v+1/u=1/f

so substitute given values we GET

1/v=1/20=1/(-30)

now be careful as there is negative sign

so 1/v=1/(-30)-1/20

=1/30+1/20

=(30+20)/30×20

=50/600

thus 1/v=1/12

hence v=12

hence the image is formed above principal axis and lies to the ryt of it ie in quadrant 1

hence image is likely to form 12 cm infronnt of the mirror


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