JEE MAIN - Physics (2019 - 9th April Evening Slot - No. 21)
Diameter of the objective lens of a telescope is
250 cm. For light of wavelength 600nm.
coming from a distant object, the limit of
resolution of the telescope is close to :-
3.0 × 10–7 rad
4.5 × 10–7 rad
1.5 × 10–7 rad
2.0 × 10–7 rad
Explanation
Limit of resolution = $${{1.22\lambda } \over d}$$
= $${{1.22 \times 600 \times {{10}^{ - 9}}} \over {250 \times {{10}^{ - 2}}}}$$
= 2.9 × 10–7 rad.
= $${{1.22 \times 600 \times {{10}^{ - 9}}} \over {250 \times {{10}^{ - 2}}}}$$
= 2.9 × 10–7 rad.
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