Question

. An object is 6 cm high. It is desired to form a real image 2 cm high at
80 cm from a mirror. What type of mirror is required for this purpose
and what shall be its focal length ?​

Answer 1

Answer:

It is desired to form a real image 2cm high at 60cm from the mirror. What type of ... Focal lenght of convex mirror = ? cm. Object distance u = ? cm. Image distance v = 60 cm.

Answer 2

Answer:

Height of object ho = 4 cm

Focal lenght of convex mirror = ? cm

Object distance u = ? cm

Image distance v = 60 cm

Image height hi = 2 cm

Magnification m = hi/ho = 2/4=1/2

v/u = 1/2

60cm/u = 1/2

u = 120 cm

mirror formula: 1/v + 1/u = 1/-f

1/-f = 1/v + 1/u

= 1/60 + 1/120

= 3/120 = 1/40

⇒ f= -40 cm