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CBSE Class 10 Answered

A candle is kept 49 CM away from a spherical convex mirror of radius of curvature 70cm find image formed and its magnification
Asked by ravishankar.lala | 15 Jun, 2019, 10:03: PM
answered-by-expert Expert Answer
Radius of curvature= 70 cm
Thus, focal length, f = 70/2 = + 35 cm ( focus of convex mirror)
u = - 49 cm ( object is placed to left side of mirror)
 
By mirror formula, 
1/f =  ( 1/v) + (1/ u)
1/35 = 1/v + (1/(-49))
1/35 = 1/v - 1/49
1/v = (1/35) + (1/49)
Thus, 
v = 20 cm 
 
For magnification of spherical mirrors,
m = -v/u 
Thus, 
m = -20/(-49 )
m = 0.40
Thus, image formed by the mirror is virtual, erect and diminished 
 
 
Answered by Shiwani Sawant | 16 Jun, 2019, 06:35: AM

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