A converging lens and a screen are placed 20 cm and 80 cm respectively from an object in a straight line so that a sharp image of the object is formed on the screen. If the object is 3cm high. Calculate the height of the image formed

Wawaaaaaaaaaaaqa

2 years ago

where u = object distance
v= image distance
hi= image height
ho= object height

Truss

1 year ago

We are given:

Object distance, (always taken as negative in lens formula, so )

Image distance,

Object height,


We use the magnification formula:

\text{Magnification (M)} = \frac{h_i}{h_o} = \frac{v}{u}

Substitute the values:

\frac{h_i}{3} = \frac{80}{-20} = -4

h_i = -4 \times 3 = -12 \, \text{cm}

The negative sign indicates that the image is inverted, but the magnitude is:

\boxed{12 \, \text{cm}}

Correct answer:

C. 12 cm

Mylordjesus

4 years ago

why was 20 subtracted from 80 to get image height

chimafresh

5 years ago

The first volume is 80cm and. U guys used 60cm and the answer is 12 not 8

Pinki456

2 years ago

The answer is d

Zitao

5 years ago

they put 80 instead of 60 that made me to FAILLLLL is that fair rubbishhhhhhhhh