A man standing at a position X in front of a plane mirror, a distance

1.	A man standing at a position X in front of a plane mirror, a distance of y metre from the mirror as shown in figure. When the man moves 5 m away from the mirror, the new distance between the man and his image becomes 20 metre. What is the value of y?(A) 5 m (B)10 m (C) 20 m (D) 40 m
Answer» Correct option (A) 5 m Explanation: New distance between the man and the mirror = y+5 ∴ The distance between the man and his image (y+5)x 2 =20 2y +10=20 2y =10 y= 5 m

A man standing at a position X in front of a plane mirror, a distance of y metre from the mirror as shown in figure. When the man moves 5 m away from the mirror, the new distance between the man and his image becomes 20 metre. What is the value of y?(A) 5 m (B)10 m (C) 20 m (D) 40 m

Answer»

Correct option (A) 5 m

Explanation:

New distance between the man and the mirror = y+5

∴ The distance between the man and his image

(y+5)x 2 =20

2y +10=20

2y =10

y= 5 m