1.

A concave mirror of focal length 20 cm forms a real image having samesize of object. Which of the following options is correct?A) Object distance is 10 cm.B) Object distance is 40 cm.C) Object distance is 20 cm.D) Object distance is 30 cm.

Answer»

We know that mirror formula

1/v + 1/u = 1/f

Concave mirror having same size at the object

v = u

1/u + 1/u = 1/f

2/u = 1/f

u = 2f

u = 2 x 20

u = 40 cm

Option B is correct.



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