In a double-slit experiment using light of wavelength 600 nm and the angular width of the fringe formed on a distant screen is 0.1 radians.
a. λ=600 nm, θ=0.1 radians
b. λ=600 nm, θ=0.2 radians
c. λ=300 nm, θ=0.1 radians
d. λ=300 nm, θ=0.2 radians