0.4 cm away from the mirror
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0.4 cm towards the mirror
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0.8 cm towards the mirror
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0.8 cm away from the mirror
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Light - Reflection and Refraction
1/v + 1/u = 1/fu= -10v=-40 (real image)-1/40-1/10 = 1/f-5/40 = 1/f-1/8 = 1/ff=-8
the focal length if the concave mirror is -8
Here, Object distance, u= -10cm , Image distance,v= -40cm (since it is a real image)f =?Using mirror formula , we have 1/f = 1/u + 1/v1/f = -1/10 + (-1/40) =-1/10 -1/40 1/f = -5/40 f= -40/5 = -8cmThus, focal length , f= -8cm
Q7. Suppose height of object is 3 cm. Height of image is 12 cm. What is the magnification?