Will a concave lens made of a a material with some definite index of refraction

Question

Will a concave lens made of a a material with some definite index of refraction form a real image if immersed in a substance of index of refraction larger than that of the lens?
E.g., a concave lens "made" of air, immersed in water.

Answer the question generally, that is for arbitrary indices of refraction, and quantitatively (i.e. I want a mathematical expression). Then, consider the particular case of a symmetric concave lens of index of refraction 1 immersed in water (n = 1.5, I think). If it does, how does the index of refraction change? Is it deterministic (can you calculate it)?

Explanation / Answer

F is negative for concavve lens

1/F = ((ng/nm-1)*(- (1/R1) - (1/R2))

if nm > ng....ng / nm is negative...........F becomes positive

it acts like a converging lens a real image

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.