AP EAMCET · PHYSICS · Ray Optics
A girl of height \(150 \mathrm{~cm}\) with her eye level at \(140 \mathrm{~cm}\) stands in front of plane mirror of height \(75 \mathrm{~cm}\) fixed to a wall. The lower edge of the mirror is at a height of \(85 \mathrm{~cm}\) above her feet level. The height of her image the girl can see in the mirror is
- A 130 cm
- B 140 cm
- C 120 cm
- D 150 cm
Answer & Solution
Correct Answer
(C) 120 cm
Step-by-step Solution
Detailed explanation
Ray diagram of a girl standing in front of a plane mirror is given below, Applying the property of triangle and from similar triangles \(O P M_1\) and \(O I_1 I_2\), \( \tan \theta=\frac{P M_1}{O P}=\frac{I_1 I_2}{O I_1} \) Since, \(\quad P M_1=140-85=55 \mathrm{~cm}\) Let…
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