A) 10 cm
B) 15 cm
C) 2.5 cm
D) 5 cm
Correct Answer: D
Solution :
By mirror formula, image distance of A \[\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\] \[\frac{1}{{{v}_{A}}}+\frac{1}{u}=\frac{1}{f}\] \[\frac{1}{{{v}_{A}}}+\frac{1}{(-30)}=\frac{1}{-10}\] \[{{v}_{A}}=-15\,cm\] Also image distance of C \[{{v}_{C}}=-20\,cm\] The length of image \[=|{{v}_{A}}-{{v}_{C}}|\] \[=|-15-(-20)|\] \[=5\,cm\]You need to login to perform this action.
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