Question

A student conducts an experiment using a convex lens of focal length 20 cm and an
object of height 15 cm. He placed the object at 25 cm from the lens. Can the image
be formed on a screen? Where should the screen be placed in order to get the
sharpest image?

Answer 1

Answer:

Given,

object height h

1

=1.5 cm

real image length h

2

=−3cm

Position of object from the mirror u=−15cm

Mirror magnification formula

m=

h

1

h

2

=−

u

v

1.5

−3

=

−15

−v

v=−30cm

Apply Mirror formula

f

1

=

−30

1

+

−15

1

f=−10cm

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