Question

An object of height 5 cm is held 20 cm away from converging mirror of focal length 10 cm

find the position , nature and size of the image formed .
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Answer 1

Explanation:

converging mirror means concave mirror

sine convemtions f(focal length -ve) u(object distance -ve) v ( image distance - ve) exept one case i.e between focal length and principle axis you should know if you are in 10th

height(h) = 5 cm

u. = -20 cm see sign convemtions

v. =. ?

f. =. - 10 cm

1/u+1/v=1/f (mirror formulae)

-1/20+1/v= -1/10

1/v= -1/10+1/20

1/v= -1/20

v= - 20 cm

position is - 20 cm

virtual and erect as it is behind the mirror

size of image = h'

to find -:

-v/u = h'/h

h is given

-(-20)/(-10)=h'/5

-2×5=h'

-10 = h'

height of image = 10 cm as height can never be negative

Hope it helps it is very important ch for cbse class 10 exams study well bro....☺️✌️