JEE PYQ: Ray Optics Question 36
Question 36 - 2019 (09 Apr Shift 1)
A concave mirror for face viewing has focal length of 0.4 m. The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is:
(1) 0.24 m
(2) 1.60 m
(3) 0.32 m
(4) 0.16 m
Show Answer
Answer: (3)
Solution
$+5 = \frac{v}{u} \Rightarrow v = -5u$ Using $\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$ $\frac{1}{-5u} + \frac{1}{u} = \frac{1}{0.4}$ $\therefore u = -0.32$ m.
BETA
