Question

Two objects $A$ and $B$ are placed at $15\, cm$ and $25\, cm$ from the pole in front of a concave mirros having radius of curvature $40\, cm$. The distance between images formed by the mirror is

• A. $40 \,cm$
• B. $160 \,cm$
• C. $60 \,cm$
• D. $100\, cm$

Answer 1

Answer: (B)

$160 \,cm$

Answer 2

by mirror formula
v1​+u1​=f1​
v1​1​+−151​=(−20)1​
v1​1​=−201​+151​
=60−3+4​
v1​=60cm
v2​1​+(−25)1​=(−20)1​
v2​1​=20−1​+251​
=100−5+4​=100−1​
v2​=−100cm
d=60+100=160cm