SATHEE: Optics Question 700

Optics Question 700

Question: If the focal length of a double convex lens for red light is $f_{R},$ its focal length for the violet light is

[EAMCET 2005]

Options:

A) $f_{R}$

B) Greater than $f_{R}$

C) Less than $f_{R}$

D) $2 f_{R}$

Show Answer

Answer:

Correct Answer: C

Solution:

$f \propto \frac{1}{μ - 1}$ and $μ \propto \frac{1}{λ}$ .

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Optics Question 700

Question: If the focal length of a double convex lens for red light is fR, its focal length for the violet light is

Options:

Answer:

Solution:

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Question: If the focal length of a double convex lens for red light is $f_{R},$ its focal length for the violet light is