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?

Question

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? (A) 60 cm (B) 30 cm (C) 90 cm (D) 40 cm

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/f2f52a49a808160e714d469fe4fd5240-.png" /> As shown in figure the distance between the lenses should be 30 cm.

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

$60 c m$

$30 c m$

$90 c m$

$40 c m$

As shown in figure the distance between the lenses should be $30 c m$ .

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

60cm

30cm

90cm

40cm