First slide

The lens

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

Moderate

A

Disappear
B

Remain as real image still
C

Be virtual and of the same size as the object
D

Suffer from aberrations

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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