1 Optical Instruments
Calculate the limit of resolution of a telescope objective having a diameter of 200 cm, if it has to detect light o f wavelength 500 nm coming from a star ;-
1) $$305 \times 10^{-9}$$ radian 2) $$152.5 \times 10^{-9}$$ radian 3) $$610 \times 10^{-9}$$ radian 4) $$457.5 \times 10^{-9}$$ radian
Solution:
Limit of resolution of telescope = $$\frac{1.22 \lambda}{D}$$
$$\theta = \frac{1.22 \times 500 \times 10^{-9}}{200 \times 10^{-2}} = 305 \times 10^{-9}$$ radian
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