A thin symmetrical double convex lens of refractive index ₂=1.5 is placed between a medium of refractive index ₁=1.4 to the left and another medium of refractive index ₃=1 6 to the right. Then, the system behaves as

Step-by-step solution

For first refracting surface, For parallel beam of light; - ₁ u + ₂ V = ₂-1 R aligned & - 1 4 - + 1 5 V = 1 5-1.4 R & V=15 R aligned For second refracting surface, aligned & - ₂ 1.5 R + ₃ V^ = ₃- ₂ R & - 1.5 15 R + 1.6 V^ = 1.6-1.5 R V^ = aligned Hence, the combination behaves as glass plate.