Question

An object 1.2 cm high is to be placed on the axis of spherical mirror to form an erect image, which is 20% smaller than object, 5cm from mirror. The focal length of mirror is 30 cm. Find 1) What type of mirror should be used? 2) Where should object be located? 3) u=? ( Give detailed solution with method)

Answer 1

convex mirror should be used. object should be located 30/7 cm in front of mirror.
mirror formulae- 1/v+1/u=1/f
v=-5cm f=30cm u=?
-1/5-1/u=1/30
-1/u=1/30+1/5=7/30
u=-30/7
the object is placed at a distance of 30/7cm from the mirror.

Answer 2

Answer:

u= -30/7cm

Explanation:

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