You view your face in a concave mirror of focal length 20 cm and wish it to be magnified by a factor of 1.5. What should you do?

u = 6.667 cm

Explanation:

given,

Focal length of the concave mirror, f = 20 cm

magnification factor = 1.5  

we know,

v is the distance of the image

u is the distance of the object

v = -1.5 u

Using mirror formula

u = 6.667 cm

distance of the person from the mirror is equal to 6.667 cm.

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y

answer( sicar );