Question

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3. You sh to creak an image that fs 10m nd half the ndight of objet ou wish accom plish thissng one sphertial nikrad mirror do miroc a. What be real or virtval ocal leneth o C What is the miros hat wovld aco ngis'h His 1

Answer 1

a) As image has to be upright and small, we need convex mirror . Convex mirror makes small and upright and virtual image for all positions of real object.

b) Image formed is virtual

c) magnification , m = - di/do

As image is upright and hal the size of object, m=1/2

1/2 = - di/do .........1

As image is virtual and distance between object and image is 10m,

do - di = 10 ...........2

Solving 1 and 2 , we get

di = -10/3 and do = 20/3

Using mirror formula, 1/do+1/di =1/f, we get

3/20 - 3/10 = 1/f

f = -20/3 = -6.7 m ( - ve sign means a convex mirror)