Could you please check these?
The work of which scientist(s) helped to explain light's ability to propagate through a vacuum?
++A. Maxwell
B. Davisson and Germer
C. Fresnel, Fraunhofer, and Arago
D. Newton
An object that has a height of 0.4 meter is placed at a distance of 0.7 meter from a concave spherical mirror. An image is formed in front of the mirror and has a height of 0.35 meter. How far from the mirror is the image located?
A. 0.8000 m
++B. 0.6125 m
C. 0.2000 m
D. 0.4275 m
If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface, we're really trying to figure out the
++A. illuminance of a surface.
B. luminous intensity.
C. luminous flux.
D. incandescence.
In any one material, all electromagnetic waves have the same
+++A. velocity.
B. frequency.
C. wavelength.
D. amplitude.
The illuminance on a surface is 6 lux and the surface is 4 meters from the light source. What is the intensity of the source?
A. 72 candelas
+++B. 96 candelas
C. 24 candelas
D. 144 candelas