Muskaan performed an activity using a concave mirror of a focal length 20 cm. She placed the object at 30 cm in front of the mirror. Where is the image likely to be formed?
In the given question, u = – 30 cm and f = -20 cm. so, the object lies between F (20 cm) & C (40 cm).
Therefore, a real image is formed beyond C, that is beyond 40 cm.
Formula is: (Try to understand) –
1/f = 1/v + 1/u
= – 1/20 = 1/v – 1/30
= 1/v = -1/20 + 1/30 = -3+2/60
= -1/60
V = – 60
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[C] 60 cm in front of the mirror