Question

A CONVEX LENS HAS FOCAL LENGTH OF 10 CM. AT WHAT DISTANCE LENS SHOULD BE PLACED SO IT FORMS REAL AND INVERTED IMAGE?IF OBJECT IS 20 CM AWAY FROM LENS. WHAT IS SIZE OF IMAGE IF LENS IS 2 M HIGH? DRAW RAY DIAGRAM

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Answer 1

•Focal length=10cm

•Image distance=20cm

Using sign convention,

F is positive and v is also positive

Therefore, Lens formula,

1/F=1/v-1/u

1/10=1/20–1/u

1/u=1/20–1/10

1/u=(10–20)/200

1/u=-10/200

u=-20

Object distance=20cm(minus indicates that the lens is converging lens)

H1=height of image and H2=height of object

H1/H2=-v/u

H1/2=-20/20

H1=2cm

Therefore, height of image is 2cm.

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Answer 2

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