Question

Choose the correct answer–


(i) If we rotate a plane mirror by 2θ, then the reflected ray will rotate by–


(a) 2θ (b) 3θ (c) 4θ (d) θ

(ii) What should be the minimum length of the plane mirror if a person wants to see his

full image?


(a) One fourth of the person's height (b) One third of the person's height

(c) equal to the person's height (d) One half of the person's height


(iii) How many images will be formed of an object kept between two mirrors making 45°

with eachother?


(a) 5 (b) 6 (c) 7 (d) 8


(iv) If an object is placed at a distance of 3 cm from the mirror, then the distance between

the image and the object will be–


(a) 4 cm (b) 6 cm (c) 3 cm (d) 12 cm

Answer 1

(i) Rotating a plane mirror by an angle of 2θ will result in rotation of reflected ray by an angle of 4θ.

(ii) The minimum length of a plane mirror which allows a man to see his full image will be half the person’s height.

(iii) For two mirrors making an angle θ with each other Number of images

n = 360/θ (when n is odd)

Number of images n = (360/θ) -1 (when n is even) Thus the number of images will be 7.

(iv)Distance between object and image in plane mirror = 2*(Distance between object and mirror)

Distance= 6 cm

Answer 2

Answer:

c

Explanation:

because if u add it up