Question

A square ABCD of side 1 mm is kept at distance 15 em infront of the concave mirror as shown in
figure. The focal length of the mirror is 10 cm. The length of the perimeter of its image will be:

1)8 mm
2) 2 mm
3) 12 mm
4) 6 mm​

Answer 1

12 mm

Explanation:

⇒ A,B, = CD =2×1 = 2mm

⇒ B,C, = A,D = 4 mm

2+2+4+4=12mm