Question

An object is placed symmetricaly between to plane mirrors inclined at angle 30 the number of images formed is

Answer 1

$\underline{\boxed{ \huge\purple{ \rm{Answer}}}} \\ \\ \implies \rm \: \red{ \eta = \frac{360 \degree}{ \theta}} \\ \\ \therefore \rm \: \eta = \frac{360 \degree}{30 \degree} = 12 \\ \\ \implies \rm \: 12 \: is \: \blue{even} \: number \\ \\ \therefore \rm \: no. \: of \: image = \eta - 1 = 12 - 1 = 11 \\ \\ \implies \rm \: final \: answer = \underline{ \boxed{ \rm{ \orange{11}}}}$