Question

If a convex mirror is placed at 33.5 cm mark while measuring focal length of mirror by using convex lens. Now mirror is removed and image is obtained at 16.1 cm mark. Focal length of mirror is –

• A. 17.4 cm
• B. 8.7 cm
• C. 33.5 cm
• D. 16.1 cm

Answer 1

Answer: (B)

8.7 cm

Answer 2

f = = $\frac { 33.5 - 16.1 } { 2 }$ = 8.7 cm