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If the distance between the virtual imag...

If the distance between the virtual image from Its real object is 60 cm in case of a concave mirror . The focal length of the concave mirror If the image formed is 3 times magnified image is

Text Solution

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The correct Answer is:
22.5

`x=3x =60 rArr x =15 cm`
`u= -15 cm`
`m= +3`
`:.m= (f)/(f-u) rArr +3 = (f)/(f-(-15))`
`:.3f+45 =f rArr f= -22.5 cm`
`|f|=22.5 cm`
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