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Vidisha Barwal Grade: 11
        

An object 1 cm high is placed at a distance of 1.5 m from the screen. How far a concave mirror be placed so that it may form a 2cm high image of the object on the screen? Also find the focal length of the mirror.

6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

since image is larger than object so its image is virtual ...


let the mirror is placed at u distance far from object & v distance far from screen...     (mirror is bw object & screen)


v/u = 2/1 = 2


v = 2u                   (given)


v + u = 1.5           


u = 1.5/3 = -50cm


v = 100


focal length = f


applying lens formula


1/v + 1/u =1/f


-1/50 + 1/100 = 1/f


f = -100cm


thus mirror should be placed at a distance 100cm from screen...


approve my ans if u like it

6 years ago
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