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  4. A parallel beam of light is incident on the system of two convex lenses of focal lengths f1=20 cm and f2=10 cm. What should be the distance between the two lenses so that rays after refraction from both the lenses pass undeviated?

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Q. A parallel beam of light is incident on the system of two convex lenses of focal lengths $f_{1}=20\, cm$ and $f_{2}=10\, cm$. What should be the distance between the two lenses so that rays after refraction from both the lenses pass undeviated?Physics Question Image

Ray Optics and Optical Instruments

Solution:

image
As shown in figure the distance between the lenses should be $30\, cm$.