First slide

The lens

Question

The combination of a convex lens (f = 18 cm) and a thin concave lens (f = 9 cm) is

Moderate

A

A concave lens (f = 18 cm)
B

A convex lens (f = 18 cm)
C

A convex lens (f = 6 cm)
D

A concave lens (f = 6 cm)

Solution

$\frac{1}{F} = \frac{1}{+ 18} + \frac{1}{(- 9)} \Rightarrow F = - 18 cm (i.e. concave lens)$

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