First slide

The lens

Question

A beam of parallel rays is brought to a focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is

Moderate

A

The focal point shifts away from the lens by a small distance
B

The focus remains undisturbed
C

The focus shifts to infinity
D

The focal point shifts towards the lens by a small distance

Solution

$\frac{1}{F} = \frac{1}{f_{1}} + \frac{1}{f_{2}} \frac{1}{F} = \frac{1}{f_{}} - \frac{1}{f} = 0 P = \infty$

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