Question

Wavelength of light used in an optical instrument are λ₁ = 4000 Å and λ₂ = 5000 Å, then ratio of their respective resolving powers (corresponding to λ₁ and λ₂) is ______.

Options

• 16 : 25

• 9 : 1

• 4 : 5

• 5 : 4

Answer 1

Wavelength of light used in an optical instrument are λ₁ = 4000 Å and λ₂ = 5000 Å, then ratio of their respective resolving powers (corresponding to λ₁ and λ₂) is 5 : 4.

Explanation:

The wavelength of light used affects an optical instrument's resolving power in an inverse manner.

`("R"."P")_1/("R"."P")_2 = lambda_1/lambda_2 = 5000/4000 = 5/4`