A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?

Anela

1 year ago

OR

recall;
f=r/2
=36/2
=18

M=3
u=?

M=f/u-f
3=18/u-18

CROSS MULTIPLY ✖️
3(u-18)=18

3u-54=18

COLLECT LIKE TERMS
3u=18+54
3u=72

u=72/3
=24

Deepthinker581

4 years ago

RC=36
Image size=3
36/2=12
V+U image =2
No too reason am na just freestyle 😂
12×2
24cm

Chipsin

6 months ago

please more explanation

usadara

2 years ago

The correct answer is A Not B because the magnification equal -v/u for mirrors and not v/u for lenses when when we used mirror magnification formula the correct answer is 12cm.