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A Converging Lens of Focal Length 5 Cm is Placed at a Distance of 20 Cm from a Screen. How Far from the Lens Should an Object Be Placed So as to Form Its Real Image on the Screen? - Science

A converging lens of focal length 5 cm is placed at a distance of 20 cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen?

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Focal length, = 5 cm
Image distance, = Distance of the lens from the screen = +20 cm (for real image)
Object distance, = ?
Applying lens formula, we get:
1/v-1/= 1/f
1/20-1/= 1/5
1/= 1/20-1/5 =-3/20
 =-20/3 =-6.6 cm

Thus, to form a real image, the object should be placed at a distance of 6.6 cm from the lens.

Concept: Concave Lens
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Lakhmir Singh Class 10 Physics (Science)
Chapter 5 Refraction of Light
Q 15 | Page 247
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