A candle of length 2 cm is placed perpendicular to principal axis of a concave mirror of radius of curvature 40 cm at a distance of 30 cm from the mirror. A white screen is placed perpendicular to principal axis to obtain the image. If the screen is a square sheet of side 6 cm, then in which of the set of given arrangements the image can be totally obtained?

Question

G1 Physics · Accepted Answer

Derived solution: Step 1: Use the spherical-mirror relation 1/f = 1/v + 1/u with m = - v/u and R = 2f, following the Cartesian sign convention. Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is (ii) and (iv). Therefore the correct option is B.