What happens when a light ray passes through the focal point, and then reflects off of a convex mirror?

Since the focal point is located behind the convex mirror, such a mirror is said to have a negative focal length value. ... After reflection, the light rays diverge; subsequently they will never intersect on the object side of the mirror.

Explanation:

it's a b and

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m