<Dl> <Dd> P (θ) = P 0 (1 − J 0 2 (k a sin ⁡ θ) − J 1 2 (k a sin ⁡ θ)) (\ displaystyle P (\ theta) = P_ (0) (1 - J_ (0) ^ (2) (ka \ sin \ theta) - J_ (1) ^ (2) (ka \ sin \ theta))) </Dd> </Dl> <Dd> P (θ) = P 0 (1 − J 0 2 (k a sin ⁡ θ) − J 1 2 (k a sin ⁡ θ)) (\ displaystyle P (\ theta) = P_ (0) (1 - J_ (0) ^ (2) (ka \ sin \ theta) - J_ (1) ^ (2) (ka \ sin \ theta))) </Dd> <P> where J 0 (\ displaystyle J_ (0)) and J 1 (\ displaystyle J_ (1)) are Bessel functions . Hence the fractions of the total power contained within the first, second, and third dark rings (where J 1 (k a sin ⁡ θ) = 0 (\ displaystyle J_ (1) (ka \ sin \ theta) = 0)) are 83.8%, 91.0%, and 93.8% respectively . </P> <Table> <Tr> <Td> The Airy Pattern on the interval kasinθ = (− 10, 10) </Td> <Td> The encircled power graphed next to the intensity . </Td> </Tr> </Table>

The diffraction of light by the iris of the eye limits