SATHEE: Optics Question 603

Optics Question 603

Question: A biconvex lens forms a real image of an object placed perpendicular to its principal axis. Suppose the radii of curvature of the lens tend to infinity. Then the image would

[MP PET 1994]

Options:

A) Disappear

B) Remain as real image still

C) Be virtual and of the same size as the object

D) Suffer from aberrations

Show Answer

Answer:

Correct Answer: C

Solution:

$\frac{1}{f} = (μ - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}})$ For biconvex lens $R_{2} = - R_{1}$

$∴$ $\frac{1}{f} = (μ - 1) (\frac{2}{R})$ Given $R = \infty$

$∴$ $f = \infty$ , so no focus at real distance.

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Optics Question 603

Question: A biconvex lens forms a real image of an object placed perpendicular to its principal axis. Suppose the radii of curvature of the lens tend to infinity. Then the image would

Options:

Answer:

Solution:

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