Question

An object of height 6cm is placed perpendicular to the principal axis of a concave
lens of focal length 5cm. Determine the position, size and nature of the image if
the distance of the object from the lens is 10cm.​

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Ray Optics and Optical Instruments

Combination of Mirror and Lenses

An object of height 6 cm is...

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Asked on October 15, 2019 by

Yamini Shashidhar

An object of height 6 cm is placed perpendicular to the principal axis of a concave lens of focal length 5 cm. Use lens formula to determine the position, size and nature of the image if the distance of the object from the lens is 10 cm.

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ANSWER

Given : u=−10 cm f=−5 cm h

o

=6 cm

Using lens formula :

v

1

−

u

1

=

f

1

∴

v

1

−

(−10)

1

=

−5

1

⟹v=−

3

10

=−3.33 cm (- sign shows that image is virtual)

Also m=

h

o

h

i

=

u

v

∴

6

h

i

=

−10

3

−10

⟹h

i

=+2 cm (+ sign shows that image is erect)