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Image in Thin Lens by Ray Tracing

The coordinat...

Question

The coordinate of a point where parallel rays are focussed by the thin convex lens is [where focal length of convex lens is $10$ cm and it is placed along y-axis].

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Solution

The formula for a combination $P = P_{1} + P_{2}$
$\frac{1}{f} = \frac{1}{f_{1}} + \frac{1}{f_{2}} \Rightarrow \frac{1}{5} = \frac{1}{f} + \frac{1}{4}$
So $\frac{1}{f} = \frac{1}{20}$
$\Rightarrow f = 20$ cm

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